diff --git a/packages/client/package.json b/packages/client/package.json
index e6748038..e02360b6 100644
--- a/packages/client/package.json
+++ b/packages/client/package.json
@@ -18,7 +18,6 @@
         "@mtcute/file-id": "^1.0.0",
         "eager-async-pool": "^1.0.0",
         "file-type": "^16.2.0",
-        "big-integer": "1.6.48",
-        "debug": "^4.3.1"
+        "big-integer": "1.6.48"
     }
 }
diff --git a/packages/client/src/client.ts b/packages/client/src/client.ts
index b58724f5..7f5bc95e 100644
--- a/packages/client/src/client.ts
+++ b/packages/client/src/client.ts
@@ -228,6 +228,7 @@ import {
     TelegramConnection,
 } from '@mtcute/core'
 import { tdFileId } from '@mtcute/file-id'
+import { Logger } from '@mtcute/core/src/utils/logger'
 
 export interface TelegramClient extends BaseTelegramClient {
     /**
@@ -3499,6 +3500,7 @@ export class TelegramClient extends BaseTelegramClient {
     protected _catchUpChannels?: boolean
     protected _cpts: Record<number, number>
     protected _cptsMod: Record<number, number>
+    protected _updsLog: Logger
     constructor(opts: BaseTelegramClient.Options) {
         super(opts)
         this._userId = null
@@ -3522,6 +3524,8 @@ export class TelegramClient extends BaseTelegramClient {
         this._cptsMod = {}
 
         this._selfChanged = false
+
+        this._updsLog = this.log.create('updates')
     }
 
     acceptTos = acceptTos
diff --git a/packages/client/src/methods/_imports.ts b/packages/client/src/methods/_imports.ts
index 65e303ed..e1938138 100644
--- a/packages/client/src/methods/_imports.ts
+++ b/packages/client/src/methods/_imports.ts
@@ -66,3 +66,6 @@ import {
 
 // @copy
 import { tdFileId } from '@mtcute/file-id'
+
+// @copy
+import { Logger } from '@mtcute/core/src/utils/logger'
diff --git a/packages/client/src/methods/files/upload-file.ts b/packages/client/src/methods/files/upload-file.ts
index 96d76232..20566ed4 100644
--- a/packages/client/src/methods/files/upload-file.ts
+++ b/packages/client/src/methods/files/upload-file.ts
@@ -20,7 +20,6 @@ try {
     path = require('path')
 } catch (e) {}
 
-const debug = require('debug')('mtcute:upload')
 
 const OVERRIDE_MIME: Record<string, string> = {
     // tg doesn't interpret `audio/opus` files as voice messages for some reason
@@ -201,7 +200,7 @@ export async function uploadFile(
     const hash = this._crypto.createMd5()
 
     const partCount = ~~((fileSize + partSize - 1) / partSize)
-    debug(
+    this._baseLog.debug(
         'uploading %d bytes file in %d chunks, each %d bytes',
         fileSize,
         partCount,
diff --git a/packages/client/src/methods/updates.ts b/packages/client/src/methods/updates.ts
index 0854cb50..155a2c76 100644
--- a/packages/client/src/methods/updates.ts
+++ b/packages/client/src/methods/updates.ts
@@ -10,13 +10,12 @@ import {
     getBarePeerId,
     getMarkedPeerId,
     markedPeerIdToBare,
-    MAX_CHANNEL_ID, RpcError,
+    MAX_CHANNEL_ID,
 } from '@mtcute/core'
-import { isDummyUpdate, isDummyUpdates } from '../utils/updates-utils'
+import { isDummyUpdate } from '../utils/updates-utils'
 import { ChatsIndex, UsersIndex } from '../types'
 import { _parseUpdate } from '../utils/parse-update'
-
-const debug = require('debug')('mtcute:upds')
+import { Logger } from '@mtcute/core/src/utils/logger'
 
 // code in this file is very bad, thanks to Telegram's awesome updates mechanism
 
@@ -46,6 +45,8 @@ interface UpdatesState {
 
     _cpts: Record<number, number>
     _cptsMod: Record<number, number>
+
+    _updsLog: Logger
 }
 
 // @initialize
@@ -62,6 +63,8 @@ function _initializeUpdates(this: TelegramClient) {
     this._cptsMod = {}
 
     this._selfChanged = false
+
+    this._updsLog = this.log.create('updates')
 }
 
 /**
@@ -103,7 +106,7 @@ export async function _fetchUpdatesState(this: TelegramClient): Promise<void> {
     this._date = state.date
     this._seq = state.seq
 
-    debug(
+    this._updsLog.debug(
         'loaded initial state: pts=%d, qts=%d, date=%d, seq=%d',
         state.pts,
         state.qts,
@@ -463,9 +466,15 @@ async function _loadDifference(
 
         switch (diff._) {
             case 'updates.differenceEmpty':
+                this._updsLog.debug(
+                    'updates.getDifference returned updates.differenceEmpty'
+                )
                 return
             case 'updates.differenceTooLong':
                 this._pts = diff.pts
+                this._updsLog.debug(
+                    'updates.getDifference returned updates.differenceTooLong'
+                )
                 return
         }
 
@@ -474,6 +483,16 @@ async function _loadDifference(
                 ? diff.state
                 : diff.intermediateState
 
+        this._updsLog.debug(
+            'updates.getDifference returned %d messages, %d updates. new pts: %d, qts: %d, seq: %d, final: %b',
+            diff.newMessages.length,
+            diff.otherUpdates.length,
+            state.pts,
+            state.qts,
+            state.seq,
+            diff._ === 'updates.difference'
+        )
+
         await this._cachePeersFrom(diff)
 
         const { users, chats } = createUsersChatsIndex(diff)
@@ -524,8 +543,23 @@ async function _loadDifference(
                 }
 
                 if (nextLocalPts) {
-                    if (nextLocalPts > pts) continue
+                    if (nextLocalPts > pts) {
+                        this._updsLog.debug(
+                            'ignoring %s (in channel %d) because already handled (by pts: exp %d, got %d)',
+                            upd._,
+                            cid,
+                            nextLocalPts,
+                            pts
+                        )
+                        continue
+                    }
                     if (nextLocalPts < pts) {
+                        this._updsLog.debug(
+                            'fetching channel %d difference because gap detected (by pts: exp %d, got %d)',
+                            cid,
+                            nextLocalPts,
+                            pts
+                        )
                         await _loadChannelDifference.call(
                             this,
                             cid,
@@ -550,6 +584,7 @@ async function _loadDifference(
 
         this._pts = state.pts
         this._qts = state.qts
+        this._seq = state.seq
         this._date = state.date
 
         if (diff._ === 'updates.difference') return
@@ -568,6 +603,10 @@ async function _loadChannelDifference(
             await this.resolvePeer(MAX_CHANNEL_ID - channelId)
         )!
     } catch (e) {
+        this._updsLog.warn(
+            'getChannelDifference failed for channel %d: input peer not found',
+            channelId
+        )
         return
     }
 
@@ -591,7 +630,13 @@ async function _loadChannelDifference(
             filter: { _: 'channelMessagesFilterEmpty' },
         })
 
-        if (diff._ === 'updates.channelDifferenceEmpty') break
+        if (diff._ === 'updates.channelDifferenceEmpty') {
+            this._updsLog.debug(
+                'getChannelDifference (cid = %d) returned channelDifferenceEmpty',
+                channelId
+            )
+            break
+        }
 
         await this._cachePeersFrom(diff)
 
@@ -602,6 +647,13 @@ async function _loadChannelDifference(
                 pts = diff.dialog.pts!
             }
 
+            this._updsLog.warn(
+                'getChannelDifference (cid = %d) returned channelDifferenceTooLong. new pts: %d, recent msgs: %d',
+                channelId,
+                pts,
+                diff.messages.length
+            )
+
             diff.messages.forEach((message) => {
                 if (noDispatch && noDispatch.msg[channelId]?.[message.id])
                     return
@@ -612,6 +664,15 @@ async function _loadChannelDifference(
             break
         }
 
+        this._updsLog.warn(
+            'getChannelDifference (cid = %d) returned %d messages, %d updates. new pts: %d, final: %b',
+            channelId,
+            diff.newMessages.length,
+            diff.otherUpdates.length,
+            pts,
+            diff.final
+        )
+
         diff.newMessages.forEach((message) => {
             if (noDispatch && noDispatch.msg[channelId]?.[message.id]) return
             if (message._ === 'messageEmpty') return
@@ -682,10 +743,24 @@ async function _processSingleUpdate(
         }
 
         if (nextLocalPts) {
-            if (nextLocalPts > pts)
+            if (nextLocalPts > pts) {
                 // "the update was already applied, and must be ignored"
+                this._updsLog.debug(
+                    'ignoring %s (cid = %d) because already applied (by pts: exp %d, got %d)',
+                    upd._,
+                    channelId,
+                    nextLocalPts,
+                    pts
+                )
                 return
+            }
             if (nextLocalPts < pts) {
+                this._updsLog.debug(
+                    'fetching difference (cid = %d) because gap detected (by pts: exp %d, got %d)',
+                    channelId,
+                    nextLocalPts,
+                    pts
+                )
                 if (channelId) {
                     // "there's an update gap that must be filled"
                     await _loadChannelDifference.call(
@@ -709,18 +784,40 @@ async function _processSingleUpdate(
         // qts is only used for non-channel updates
         const nextLocalQts = this._qts! + 1
 
-        if (nextLocalQts > qts)
+        if (nextLocalQts > qts) {
             // "the update was already applied, and must be ignored"
+            this._updsLog.debug(
+                'ignoring %s because already applied (by qts: exp %d, got %d)',
+                upd._,
+                nextLocalQts,
+                qts
+            )
             return
-        if (nextLocalQts < qts)
+        }
+        if (nextLocalQts < qts) {
+            this._updsLog.debug(
+                'fetching difference because gap detected (by qts: exp %d, got %d)',
+                upd._,
+                nextLocalQts,
+                qts
+            )
+
             return await _loadDifference.call(
                 this,
                 noDispatch ? _createNoDispatchIndex(upd) : undefined
             )
+        }
     }
 
     // update local pts/qts
     if (pts) {
+        this._updsLog.debug(
+            'received pts-ordered %s (cid = %d), new pts: %d',
+            upd._,
+            channelId,
+            pts
+        )
+
         if (channelId) {
             this._cpts[channelId] = pts
             this._cptsMod[channelId] = pts
@@ -730,6 +827,8 @@ async function _processSingleUpdate(
     }
 
     if (qts) {
+        this._updsLog.debug('received qts-ordered %s, new qts: %d', upd._, qts)
+
         this._qts = qts
     }
 
@@ -765,6 +864,12 @@ async function _processSingleUpdate(
             // this is a short update, let's fetch cached peers
             peers = await _fetchPeersForShort.call(this, upd)
             if (!peers) {
+                this._updsLog.debug(
+                    'fetching difference because some peers were not available for short %s (pts = %d, cid = %d)',
+                    upd._,
+                    pts,
+                    channelId
+                )
                 // some peer is not cached.
                 // need to re-fetch the thing, and cache them on the way
                 return await _loadDifference.call(this)
@@ -785,7 +890,9 @@ export function _handleUpdate(
 ): void {
     // just in case, check that updates state is available
     if (this._pts === undefined) {
-        debug('received an update before updates state is available')
+        this._updsLog.warn(
+            'received an update before updates state is available'
+        )
         return
     }
 
@@ -800,8 +907,6 @@ export function _handleUpdate(
     this._updLock
         .acquire()
         .then(async () => {
-            debug('received %s', update._)
-
             // i tried my best to follow the documentation, but i still may have missed something.
             // feel free to contribute!
             // reference: https://core.telegram.org/api/updates
@@ -824,26 +929,41 @@ export function _handleUpdate(
                         // https://t.me/tdlibchat/5843
                         const nextLocalSeq = this._seq! + 1
 
-                        debug(
-                            'received %s (seq_start=%d, seq_end=%d)',
+                        this._updsLog.debug(
+                            'received %s (seq_start = %d, seq_end = %d)',
                             update._,
                             seqStart,
                             update.seq
                         )
 
-                        if (nextLocalSeq > seqStart)
+                        if (nextLocalSeq > seqStart) {
+                            this._updsLog.debug(
+                                'ignoring updates group because already applied (by seq: exp %d, got %d)',
+                                nextLocalSeq,
+                                seqStart
+                            )
                             // "the updates were already applied, and must be ignored"
                             return
-                        if (nextLocalSeq < seqStart)
+                        }
+                        if (nextLocalSeq < seqStart) {
+                            this._updsLog.debug(
+                                'fetching difference because gap detected (by seq: exp %d, got %d)',
+                                nextLocalSeq,
+                                seqStart
+                            )
                             // "there's an updates gap that must be filled"
                             // loading difference will also load any updates contained
                             // in this update, so we discard it
                             return await _loadDifference.call(this)
+                        }
                     }
 
                     const hasMin = await this._cachePeersFrom(update)
                     if (hasMin) {
                         if (!(await _replaceMinPeers.call(this, update))) {
+                            this._updsLog.debug(
+                                'fetching difference because some peers were min and not cached'
+                            )
                             // some min peer is not cached.
                             // need to re-fetch the thing, and cache them on the way
                             return await _loadDifference.call(this)
@@ -1005,6 +1125,6 @@ export function catchUp(this: TelegramClient): Promise<void> {
 
 /** @internal */
 export function _keepAliveAction(this: TelegramClient): void {
-    debug('no updates for >15 minutes, catching up')
+    this._updsLog.debug('no updates for >15 minutes, catching up')
     this.catchUp().catch((err) => this._emitError(err))
 }
diff --git a/packages/core/package.json b/packages/core/package.json
index 78bf83e9..509937fc 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -14,6 +14,7 @@
     "browser": {
         "./utils/platform/crypto.js": "./utils/platform/crypto.web.js",
         "./utils/platform/transport.js": "./utils/platform/transport.web.js",
+        "./utils/platform/logging.js": "./utils/platform/logging.web.js",
         "./storage/json-file.js": false
     },
     "dependencies": {
@@ -23,7 +24,6 @@
         "leemon": "6.2.0",
         "pako": "2.0.2",
         "big-integer": "1.6.48",
-        "debug": "^4.3.1",
         "events": "3.2.0"
     },
     "devDependencies": {
diff --git a/packages/core/scripts/get-user-token-for-e2e.ts b/packages/core/scripts/get-user-token-for-e2e.ts
index 17344287..f126e5f7 100644
--- a/packages/core/scripts/get-user-token-for-e2e.ts
+++ b/packages/core/scripts/get-user-token-for-e2e.ts
@@ -1,7 +1,6 @@
 import { BaseTelegramClient, defaultDcs } from '../src'
 
 require('dotenv-flow').config({ path: __dirname + '/../' })
-require('debug').enable('mtcute:*')
 
 if (!process.env.API_ID || !process.env.API_HASH) {
     console.warn('Set API_ID and API_HASH env variables')
diff --git a/packages/core/src/base-client.ts b/packages/core/src/base-client.ts
index 8f59b24d..05e5a5cf 100644
--- a/packages/core/src/base-client.ts
+++ b/packages/core/src/base-client.ts
@@ -38,8 +38,7 @@ import { BinaryWriter } from './utils/binary/binary-writer'
 import { encodeUrlSafeBase64, parseUrlSafeBase64 } from './utils/buffer-utils'
 import { BinaryReader } from './utils/binary/binary-reader'
 import EventEmitter from 'events'
-
-const debug = require('debug')('mtcute:base')
+import { LogManager } from './utils/logger'
 
 export namespace BaseTelegramClient {
     export interface Options {
@@ -269,6 +268,9 @@ export class BaseTelegramClient extends EventEmitter {
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
     protected _handleUpdate(update: tl.TypeUpdates): void {}
 
+    readonly log = new LogManager()
+    protected readonly _baseLog = this.log.create('base')
+
     constructor(opts: BaseTelegramClient.Options) {
         super()
 
@@ -299,6 +301,8 @@ export class BaseTelegramClient extends EventEmitter {
         this._disableUpdates = opts.disableUpdates ?? false
         this._niceStacks = opts.niceStacks ?? true
 
+        this.storage.setup?.(this._baseLog)
+
         this._layer = opts.overrideLayer ?? tl.CURRENT_LAYER
 
         let deviceModel = 'MTCute on '
@@ -361,7 +365,7 @@ export class BaseTelegramClient extends EventEmitter {
             testMode: this._testMode,
             reconnectionStrategy: this._reconnectionStrategy,
             layer: this._layer,
-        })
+        }, this.log.create('connection'))
         this.primaryConnection.on('usable', async (isReconnection: boolean) => {
             this._lastUpdateTime = Date.now()
 
@@ -595,7 +599,7 @@ export class BaseTelegramClient extends EventEmitter {
                 lastError = e
 
                 if (e instanceof InternalError) {
-                    debug('Telegram is having internal issues: %s', e)
+                    this._baseLog.warn('Telegram is having internal issues: %s', e)
                     if (e.message === 'WORKER_BUSY_TOO_LONG_RETRY') {
                         // according to tdlib, "it is dangerous to resend query without timeout, so use 1"
                         await sleep(1000)
@@ -624,7 +628,7 @@ export class BaseTelegramClient extends EventEmitter {
                         params?.throwFlood !== true &&
                         e.seconds <= this._floodSleepThreshold
                     ) {
-                        debug('Flood wait for %d seconds', e.seconds)
+                        this._baseLog.info('Flood wait for %d seconds', e.seconds)
                         await sleep(e.seconds * 1000)
                         continue
                     }
@@ -636,14 +640,14 @@ export class BaseTelegramClient extends EventEmitter {
                         e.constructor === UserMigrateError ||
                         e.constructor === NetworkMigrateError
                     ) {
-                        debug('Migrate error, new dc = %d', e.newDc)
+                        this._baseLog.info('Migrate error, new dc = %d', e.newDc)
                         await this.changeDc(e.newDc)
                         continue
                     }
                 } else {
                     if (e.constructor === AuthKeyUnregisteredError) {
                         // we can try re-exporting auth from the primary connection
-                        debug('exported auth key error, re-exporting..')
+                        this._baseLog.warn('exported auth key error, re-exporting..')
 
                         const auth = await this.call({
                             _: 'auth.exportAuthorization',
@@ -700,14 +704,14 @@ export class BaseTelegramClient extends EventEmitter {
             reconnectionStrategy: this._reconnectionStrategy,
             inactivityTimeout,
             layer: this._layer,
-        })
+        }, this.log.create('connection'))
 
         connection.on('error', (err) => this._emitError(err, connection))
         connection.authKey = await this.storage.getAuthKeyFor(dc.id)
         connection.connect()
 
         if (!connection.authKey) {
-            debug('exporting auth to DC %d', dcId)
+            this._baseLog.info('exporting auth to DC %d', dcId)
             const auth = await this.call({
                 _: 'auth.exportAuthorization',
                 dcId,
@@ -807,7 +811,7 @@ export class BaseTelegramClient extends EventEmitter {
         const parsedPeers: ITelegramStorage.PeerInfo[] = []
 
         let hadMin = false
-
+        let count = 0
         for (const peer of getAllPeersFrom(obj)) {
             if ((peer as any).min) {
                 // absolutely incredible min peer handling, courtesy of levlam.
@@ -816,6 +820,8 @@ export class BaseTelegramClient extends EventEmitter {
                 continue
             }
 
+            count += 1
+
             switch (peer._) {
                 case 'user':
                     parsedPeers.push({
@@ -854,6 +860,10 @@ export class BaseTelegramClient extends EventEmitter {
 
         await this.storage.updatePeers(parsedPeers)
 
+        if (count > 0) {
+            this._baseLog.debug('cached %d peers, had min: %b', count, hadMin)
+        }
+
         return hadMin
     }
 
diff --git a/packages/core/src/network/authorization.ts b/packages/core/src/network/authorization.ts
index 96dc75f6..95090b1e 100644
--- a/packages/core/src/network/authorization.ts
+++ b/packages/core/src/network/authorization.ts
@@ -16,8 +16,6 @@ import {
     bufferToBigInt,
 } from '../utils/bigint-utils'
 
-const debug = require('debug')('mtcute:auth')
-
 // Heavily based on code from https://github.com/LonamiWebs/Telethon/blob/master/telethon/network/authenticator.py
 
 const DH_SAFETY_RANGE = bigIntTwo.pow(2048 - 64)
@@ -45,9 +43,11 @@ export async function doAuthorization(
         return connection.send(writer.result())
     }
 
+    const log = connection.log.create('auth')
+
     const nonce = randomBytes(16)
     // Step 1: PQ request
-    debug(
+    log.debug(
         '%s: starting PQ handshake, nonce = %h',
         connection.params.dc.ipAddress,
         nonce
@@ -61,7 +61,7 @@ export async function doAuthorization(
     if (resPq._ !== 'mt_resPQ') throw new Error('Step 1: answer was ' + resPq._)
     if (!buffersEqual(resPq.nonce, nonce))
         throw new Error('Step 1: invalid nonce from server')
-    debug('%s: received PQ', connection.params.dc.ipAddress)
+    log.debug('%s: received PQ', connection.params.dc.ipAddress)
 
     // Step 2: DH exchange
     const publicKey = findKeyByFingerprints(resPq.serverPublicKeyFingerprints)
@@ -72,14 +72,14 @@ export async function doAuthorization(
                     .map((i) => i.toString(16))
                     .join(', ')
         )
-    debug(
+    log.debug(
         '%s: found server key, fp = %s',
         connection.params.dc.ipAddress,
         publicKey.fingerprint
     )
 
     const [p, q] = await crypto.factorizePQ(resPq.pq)
-    debug('%s: factorized PQ', connection.params.dc.ipAddress)
+    log.debug('%s: factorized PQ', connection.params.dc.ipAddress)
 
     const newNonce = randomBytes(32)
 
@@ -98,7 +98,7 @@ export async function doAuthorization(
         dc: dcId
     } as tl.mtproto.RawP_q_inner_data_dc)
     const encryptedData = await crypto.rsaEncrypt(pqInnerData, publicKey)
-    debug('%s: requesting DH params', connection.params.dc.ipAddress)
+    log.debug('%s: requesting DH params', connection.params.dc.ipAddress)
 
     await sendPlainMessage({
         _: 'mt_reqDHParams',
@@ -131,7 +131,7 @@ export async function doAuthorization(
     //     throw new Error('Step 2: server DH failed')
     // }
 
-    debug('%s: server DH ok', connection.params.dc.ipAddress)
+    log.debug('%s: server DH ok', connection.params.dc.ipAddress)
 
     if (serverDhParams.encryptedAnswer.length % 16 != 0)
         throw new Error('Step 2: AES block size is invalid')
@@ -234,7 +234,7 @@ export async function doAuthorization(
         clientDhInnerWriter.pos = 0
         clientDhInnerWriter.raw(clientDhInnerHash)
 
-        debug(
+        log.debug(
             '%s: sending client DH (timeOffset = %d)',
             connection.params.dc.ipAddress,
             timeOffset
@@ -260,7 +260,7 @@ export async function doAuthorization(
         if (!buffersEqual(dhGen.serverNonce, resPq.serverNonce))
             throw Error('Step 4: invalid server nonce from server')
 
-        debug('%s: DH result: %s', connection.params.dc.ipAddress, dhGen._)
+        log.debug('%s: DH result: %s', connection.params.dc.ipAddress, dhGen._)
 
         if (dhGen._ === 'mt_dh_gen_fail') {
             // in theory i would be supposed to calculate newNonceHash, but why, we are failing anyway
@@ -284,7 +284,7 @@ export async function doAuthorization(
         if (!buffersEqual(expectedHash.slice(4, 20), dhGen.newNonceHash1))
             throw Error('Step 4: invalid nonce hash from server')
 
-        debug('%s: authorization successful', connection.params.dc.ipAddress)
+        log.info('%s: authorization successful', connection.params.dc.ipAddress)
 
         return [authKey, serverSalt, timeOffset]
     }
diff --git a/packages/core/src/network/mtproto-session.ts b/packages/core/src/network/mtproto-session.ts
index 3878db23..b8522c7e 100644
--- a/packages/core/src/network/mtproto-session.ts
+++ b/packages/core/src/network/mtproto-session.ts
@@ -8,8 +8,7 @@ import {
     SerializationCounter,
 } from '../utils/binary/binary-writer'
 import { BinaryReader } from '../utils/binary/binary-reader'
-
-const debug = require('debug')('mtcute:sess')
+import { Logger } from '../utils/logger'
 
 export interface EncryptedMessage {
     messageId: BigInteger
@@ -34,7 +33,7 @@ export class MtprotoSession {
     // default salt: [0x00]*8
     serverSalt: Buffer = Buffer.alloc(8)
 
-    constructor(crypto: ICryptoProvider) {
+    constructor(crypto: ICryptoProvider, readonly log: Logger) {
         this._crypto = crypto
     }
 
@@ -114,7 +113,7 @@ export class MtprotoSession {
         let encryptedData = reader.raw()
 
         if (!buffersEqual(authKeyId, this._authKeyId!)) {
-            debug(
+            this.log.warn(
                 '[%h] warn: received message with unknown authKey = %h (expected %h)',
                 this._sessionId,
                 authKeyId,
@@ -144,8 +143,8 @@ export class MtprotoSession {
             )
         ).slice(8, 24)
         if (!buffersEqual(messageKey, expectedMessageKey)) {
-            debug(
-                '[%h] warn: received message with invalid messageKey = %h (expected %h)',
+            this.log.warn(
+                '[%h] received message with invalid messageKey = %h (expected %h)',
                 this._sessionId,
                 messageKey,
                 expectedMessageKey
@@ -159,8 +158,8 @@ export class MtprotoSession {
         const messageId = innerReader.long(true)
 
         if (!buffersEqual(sessionId, this._sessionId)) {
-            debug(
-                'warn: ignoring message with invalid sessionId = %h',
+            this.log.warn(
+                'ignoring message with invalid sessionId = %h',
                 sessionId
             )
             return null
@@ -170,8 +169,8 @@ export class MtprotoSession {
         const length = innerReader.uint32()
 
         if (length > innerData.length - 32 /* header size */) {
-            debug(
-                'warn: ignoring message with invalid length: %d > %d',
+            this.log.warn(
+                'ignoring message with invalid length: %d > %d',
                 length,
                 innerData.length - 32
             )
@@ -179,8 +178,8 @@ export class MtprotoSession {
         }
 
         if (length % 4 !== 0) {
-            debug(
-                'warn: ignoring message with invalid length: %d is not a multiple of 4',
+            this.log.warn(
+                'ignoring message with invalid length: %d is not a multiple of 4',
                 length
             )
             return null
@@ -191,8 +190,8 @@ export class MtprotoSession {
         const paddingSize = innerData.length - innerReader.pos
 
         if (paddingSize < 12 || paddingSize > 1024) {
-            debug(
-                'warn: ignoring message with invalid padding size: %d',
+            this.log.warn(
+                'ignoring message with invalid padding size: %d',
                 paddingSize
             )
             return null
diff --git a/packages/core/src/network/persistent-connection.ts b/packages/core/src/network/persistent-connection.ts
index a5849fc7..fdc5258d 100644
--- a/packages/core/src/network/persistent-connection.ts
+++ b/packages/core/src/network/persistent-connection.ts
@@ -7,8 +7,7 @@ import {
     createControllablePromise,
 } from '../utils/controllable-promise'
 import { ICryptoProvider } from '../utils/crypto'
-
-const debug = require('debug')('mtcute:conn')
+import { Logger } from '../utils/logger'
 
 export interface PersistentConnectionParams {
     crypto: ICryptoProvider
@@ -51,7 +50,7 @@ export abstract class PersistentConnection extends EventEmitter {
 
     protected abstract onMessage(data: Buffer): void
 
-    protected constructor(params: PersistentConnectionParams) {
+    protected constructor(params: PersistentConnectionParams, readonly log: Logger) {
         super()
         this.params = params
         this.changeTransport(params.transportFactory)
@@ -63,7 +62,7 @@ export abstract class PersistentConnection extends EventEmitter {
         }
 
         this._transport = factory()
-        this._transport.setupCrypto?.(this.params.crypto)
+        this._transport.setup?.(this.params.crypto, this.log)
 
         this._transport.on('ready', this.onTransportReady.bind(this))
         this._transport.on('message', this.onTransportMessage.bind(this))
@@ -175,7 +174,7 @@ export abstract class PersistentConnection extends EventEmitter {
         if (!this.params.inactivityTimeout) return
         if (this._inactivityTimeout) clearTimeout(this._inactivityTimeout)
         this._inactivityTimeout = setTimeout(() => {
-            debug(
+            this.log.info(
                 'disconnected because of inactivity for %d',
                 this.params.inactivityTimeout
             )
diff --git a/packages/core/src/network/telegram-connection.ts b/packages/core/src/network/telegram-connection.ts
index e2677f1c..5e1dd537 100644
--- a/packages/core/src/network/telegram-connection.ts
+++ b/packages/core/src/network/telegram-connection.ts
@@ -23,6 +23,7 @@ import {
     RpcTimeoutError,
 } from '@mtcute/tl/errors'
 import { LruStringSet } from '../utils/lru-string-set'
+import { Logger } from '../utils/logger'
 
 function makeNiceStack(error: RpcError, stack: string, method?: string) {
     error.stack = `${error.constructor.name} (${error.code} ${error.text}): ${
@@ -30,14 +31,6 @@ function makeNiceStack(error: RpcError, stack: string, method?: string) {
     }\n    at ${method}\n${stack.split('\n').slice(2).join('\n')}`
 }
 
-const _debug = require('debug')
-const debug = _debug('mtcute:conn')
-
-// hex formatting buffers with %h
-_debug.formatters.h = (v: Buffer): string => v.toString('hex')
-// true/false formatting with %b
-_debug.formatters.b = (v: any): string => !!v + ''
-
 export interface TelegramConnectionParams extends PersistentConnectionParams {
     initConnection: tl.RawInitConnectionRequest
     inactivityTimeout?: number
@@ -112,9 +105,9 @@ export class TelegramConnection extends PersistentConnection {
         this._pendingAcks = []
     }, 500)
 
-    constructor(params: TelegramConnectionParams) {
-        super(params)
-        this._mtproto = new MtprotoSession(this.params.crypto)
+    constructor(params: TelegramConnectionParams, log: Logger) {
+        super(params, log)
+        this._mtproto = new MtprotoSession(this.params.crypto, log.create('session'))
     }
 
     onTransportClose(): void {
@@ -163,7 +156,7 @@ export class TelegramConnection extends PersistentConnection {
     protected onError(error: Error): void {
         // https://core.telegram.org/mtproto/mtproto-_transports#_transport-errors
         if (error instanceof TransportError) {
-            debug('transport error %d (dc %d)', error.code, this.params.dc.id)
+            this.log.error('transport error %d (dc %d)', error.code, this.params.dc.id)
             if (error.code === 404) {
                 this._mtproto.reset()
                 this.emit('key-change', null)
@@ -221,7 +214,7 @@ export class TelegramConnection extends PersistentConnection {
             // if a message is received before authorization,
             // either the server is misbehaving,
             // or there was a problem with authorization.
-            debug('warn: received message before authorization')
+            this.log.warn('warn: received message before authorization')
             return
         }
 
@@ -241,7 +234,7 @@ export class TelegramConnection extends PersistentConnection {
     }
 
     private _resend(it: PendingMessage, id?: string): void {
-        debug('resending %s', it.method)
+        this.log.debug('resending %s', it.method)
         this._sendBufferForResult(it).catch(it.promise.reject)
         if (it.cancel) clearTimeout(it.cancel)
         if (id) delete this._pendingRpcCalls[id]
@@ -260,7 +253,7 @@ export class TelegramConnection extends PersistentConnection {
                 this.onConnectionUsable()
             })
             .catch((err) => {
-                debug('Authorization error: %s', err.message)
+                this.log.error('Authorization error: %s', err.message)
                 this.onError(err)
                 this.reconnect()
             })
@@ -271,7 +264,7 @@ export class TelegramConnection extends PersistentConnection {
         messageId: BigInteger
     ): Promise<void> {
         if (messageId.isEven()) {
-            debug(
+            this.log.warn(
                 'warn: ignoring message with invalid messageId = %s (is even)',
                 messageId
             )
@@ -294,7 +287,7 @@ export class TelegramConnection extends PersistentConnection {
             return
         }
 
-        debug('unknown message received: %o', message)
+        this.log.warn('unknown message received: %o', message)
     }
 
     private _handleContainer(message: tl.mtproto.RawMsg_container): void {
@@ -310,10 +303,10 @@ export class TelegramConnection extends PersistentConnection {
         const reqMsgId = message.reqMsgId.toString(16)
         const pending = this._pendingRpcCalls[reqMsgId]
         if (!pending) {
-            debug('received rpc result for unknown message %s', reqMsgId)
+            this.log.warn('received rpc result for unknown message %s', reqMsgId)
             return
         }
-        debug('handling rpc result for %s (%s)', reqMsgId, pending.method)
+        this.log.request('<<< (%s) %j', pending.method, message.result)
 
         if (message.result._ === 'mt_rpc_error') {
             const error = createRpcErrorFromTl(message.result)
@@ -332,7 +325,7 @@ export class TelegramConnection extends PersistentConnection {
     private _handlePong(message: tl.mtproto.RawPong): void {
         const msgId = message.msgId.toString(16)
 
-        debug('handling pong for %s (ping id %s)', msgId, message.pingId)
+        this.log.debug('handling pong for %s (ping id %s)', msgId, message.pingId)
 
         if (this._pendingPing && message.pingId.eq(this._pendingPing)) {
             this._pendingPing = null
@@ -347,7 +340,7 @@ export class TelegramConnection extends PersistentConnection {
             pending.promise.resolve(message)
             delete this._pendingRpcCalls[msgId]
         } else {
-            debug('pong to unknown ping %o', message)
+            this.log.warn('pong to unknown ping %o', message)
         }
     }
 
@@ -356,7 +349,7 @@ export class TelegramConnection extends PersistentConnection {
     ): Promise<void> {
         const badMsgId = message.badMsgId.toString(16)
 
-        debug(
+        this.log.debug(
             'handling bad_server_salt for msg %s, new salt: %h',
             badMsgId,
             message.newServerSalt
@@ -375,7 +368,7 @@ export class TelegramConnection extends PersistentConnection {
             this._pendingPing = null
             this._pendingPingMsgId = null
         } else {
-            debug('bad_server_salt to unknown message %o', message)
+            this.log.warn('bad_server_salt to unknown message %o', message)
         }
     }
 
@@ -385,7 +378,7 @@ export class TelegramConnection extends PersistentConnection {
     ): Promise<void> {
         const badMsgId = message.badMsgId.toString(16)
 
-        debug('handling bad_msg_notification, code: %d', message.errorCode)
+        this.log.debug('handling bad_msg_notification, code: %d', message.errorCode)
 
         if (message.errorCode === 16 || message.errorCode === 17) {
             // msg_id is either too high or too low
@@ -415,7 +408,7 @@ export class TelegramConnection extends PersistentConnection {
         if (this._pendingRpcCalls[badMsgId]) {
             this._resend(this._pendingRpcCalls[badMsgId], badMsgId)
         } else {
-            debug('bad_msg_notification to unknown message %s', badMsgId)
+            this.log.warn('bad_msg_notification to unknown message %s', badMsgId)
         }
     }
 
@@ -452,7 +445,7 @@ export class TelegramConnection extends PersistentConnection {
             }
         }
 
-        debug(
+        this.log.debug(
             'handling new_session_created (sid = %h), salt: %h',
             this._mtproto._sessionId,
             message.serverSalt
@@ -463,7 +456,7 @@ export class TelegramConnection extends PersistentConnection {
     private _handleDetailedInfo(
         message: tl.mtproto.RawMsg_detailed_info
     ): void {
-        debug(
+        this.log.debug(
             'handling msg_detailed_info (sid = %h), msgId = %s',
             this._mtproto._sessionId,
             message.answerMsgId
@@ -487,7 +480,7 @@ export class TelegramConnection extends PersistentConnection {
     private _handleNewDetailedInfo(
         message: tl.mtproto.RawMsg_new_detailed_info
     ): void {
-        debug(
+        this.log.debug(
             'handling msg_new_detailed_info (sid = %h), msgId = %s',
             this._mtproto._sessionId,
             message.answerMsgId
@@ -510,7 +503,7 @@ export class TelegramConnection extends PersistentConnection {
 
     private _handleFutureSalts(message: tl.mtproto.RawFuture_salts): void {
         // TODO actually handle these salts
-        debug(
+        this.log.debug(
             'handling future_salts (sid = %h), msgId = %s, %d salts',
             this._mtproto._sessionId,
             message.reqMsgId,
@@ -663,11 +656,11 @@ export class TelegramConnection extends PersistentConnection {
         if (this._usable && this.params.inactivityTimeout)
             this._rescheduleInactivity()
 
-        debug('making rpc call %s', message._)
+        this.log.request('>>> %j', message)
 
         let obj: tl.TlObject = message
         if (!this._initConnectionCalled) {
-            debug('wrapping %s with initConnection', message._)
+            this.log.debug('wrapping %s with initConnection', message._)
             obj = {
                 _: 'invokeWithLayer',
                 layer: this.params.layer,
diff --git a/packages/core/src/network/transports/abstract.ts b/packages/core/src/network/transports/abstract.ts
index 798dd1ad..7c56bf39 100644
--- a/packages/core/src/network/transports/abstract.ts
+++ b/packages/core/src/network/transports/abstract.ts
@@ -2,6 +2,7 @@ import { tl } from '@mtcute/tl'
 import { MaybeAsync } from '../../types/utils'
 import { ICryptoProvider } from '../../utils/crypto'
 import EventEmitter from 'events'
+import { Logger } from '../../utils/logger'
 
 export enum TransportState {
     /**
@@ -50,10 +51,12 @@ export interface ITelegramTransport extends EventEmitter {
     send(data: Buffer): Promise<void>
 
     /**
-     * For transports whose codecs use crypto functions.
+     * Provides crypto and logging for the transport.
+     * Not done in constructor to simplify factory.
+     *
      * This method is called before any other.
      */
-    setupCrypto?(crypto: ICryptoProvider): void
+    setup?(crypto: ICryptoProvider, log: Logger): void
 }
 
 /** Transport factory function */
@@ -88,10 +91,10 @@ export interface IPacketCodec {
     on(event: 'packet', handler: (packet: Buffer) => void): void
 
     /**
-     * For codecs that use crypto functions.
+     * For codecs that use crypto functions and/or logging.
      * This method is called before any other.
      */
-    setupCrypto?(crypto: ICryptoProvider): void
+    setup?(crypto: ICryptoProvider, log: Logger): void
 }
 
 /**
diff --git a/packages/core/src/network/transports/tcp.ts b/packages/core/src/network/transports/tcp.ts
index a5169804..168c8df9 100644
--- a/packages/core/src/network/transports/tcp.ts
+++ b/packages/core/src/network/transports/tcp.ts
@@ -4,8 +4,7 @@ import { Socket, connect } from 'net'
 import EventEmitter from 'events'
 import { ICryptoProvider } from '../../utils/crypto'
 import { IntermediatePacketCodec } from './intermediate'
-
-const debug = require('debug')('mtcute:tcp')
+import { Logger } from '../../utils/logger'
 
 /**
  * Base for TCP transports.
@@ -20,11 +19,13 @@ export abstract class BaseTcpTransport
 
     abstract _packetCodec: IPacketCodec
     protected _crypto!: ICryptoProvider
+    protected log!: Logger
 
     packetCodecInitialized = false
 
-    setupCrypto(crypto: ICryptoProvider): void {
+    setup(crypto: ICryptoProvider, log: Logger): void {
         this._crypto = crypto
+        this.log = log.create('tcp')
     }
 
     state(): TransportState {
@@ -35,12 +36,13 @@ export abstract class BaseTcpTransport
         return this._currentDc
     }
 
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
     connect(dc: tl.RawDcOption, testMode: boolean): void {
         if (this._state !== TransportState.Idle)
             throw new Error('Transport is not IDLE')
 
         if (!this.packetCodecInitialized) {
-            this._packetCodec.setupCrypto?.(this._crypto)
+            this._packetCodec.setup?.(this._crypto, this.log)
             this._packetCodec.on('error', (err) => this.emit('error', err))
             this._packetCodec.on('packet', (buf) => this.emit('message', buf))
             this.packetCodecInitialized = true
@@ -61,7 +63,7 @@ export abstract class BaseTcpTransport
 
     close(): void {
         if (this._state === TransportState.Idle) return
-        debug('%s: close', this._currentDc!.ipAddress)
+        this.log.debug('%s: close', this._currentDc!.ipAddress)
 
         this.emit('close')
         this._state = TransportState.Idle
@@ -73,12 +75,12 @@ export abstract class BaseTcpTransport
     }
 
     async handleError(error: Error): Promise<void> {
-        debug('%s: error: %s', this._currentDc!.ipAddress, error.stack)
+        this.log.error('%s: error: %s', this._currentDc!.ipAddress, error.stack)
         this.emit('error', error)
     }
 
     async handleConnect(): Promise<void> {
-        debug('%s: connected', this._currentDc!.ipAddress)
+        this.log.debug('%s: connected', this._currentDc!.ipAddress)
         const initialMessage = await this._packetCodec.tag()
 
         if (initialMessage.length) {
diff --git a/packages/core/src/network/transports/websocket.ts b/packages/core/src/network/transports/websocket.ts
index 8785ebba..c861829f 100644
--- a/packages/core/src/network/transports/websocket.ts
+++ b/packages/core/src/network/transports/websocket.ts
@@ -6,8 +6,7 @@ import { ICryptoProvider } from '../../utils/crypto'
 import type WebSocket from 'ws'
 import { IntermediatePacketCodec } from './intermediate'
 import { ObfuscatedPacketCodec } from './obfuscated'
-
-const debug = require('debug')('mtcute:ws')
+import { Logger } from '../../utils/logger'
 
 let ws: {
     new (address: string, options?: string): WebSocket
@@ -41,6 +40,7 @@ export abstract class BaseWebSocketTransport
     private _state: TransportState = TransportState.Idle
     private _socket: WebSocket | null = null
     private _crypto!: ICryptoProvider
+    protected log!: Logger
 
     abstract _packetCodec: IPacketCodec
     packetCodecInitialized = false
@@ -69,8 +69,9 @@ export abstract class BaseWebSocketTransport
         this.close = this.close.bind(this)
     }
 
-    setupCrypto(crypto: ICryptoProvider): void {
+    setup(crypto: ICryptoProvider, log: Logger): void {
         this._crypto = crypto
+        this.log = log.create('tcp')
     }
 
     state(): TransportState {
@@ -86,7 +87,7 @@ export abstract class BaseWebSocketTransport
             throw new Error('Transport is not IDLE')
 
         if (!this.packetCodecInitialized) {
-            this._packetCodec.setupCrypto?.(this._crypto)
+            this._packetCodec.setup?.(this._crypto, this.log)
             this._packetCodec.on('error', (err) => this.emit('error', err))
             this._packetCodec.on('packet', (buf) => this.emit('message', buf))
             this.packetCodecInitialized = true
@@ -113,7 +114,7 @@ export abstract class BaseWebSocketTransport
 
     close(): void {
         if (this._state === TransportState.Idle) return
-        debug('%s: close', this._currentDc!.ipAddress)
+        this.log.debug('%s: close', this._currentDc!.ipAddress)
 
         this.emit('close')
         this._state = TransportState.Idle
@@ -125,12 +126,12 @@ export abstract class BaseWebSocketTransport
     }
 
     async handleError({ error }: { error: Error }): Promise<void> {
-        debug('%s: error: %s', this._currentDc!.ipAddress, error.stack)
+        this.log.error('%s: error: %s', this._currentDc!.ipAddress, error.stack)
         this.emit('error', error)
     }
 
     async handleConnect(): Promise<void> {
-        debug('%s: connected', this._currentDc!.ipAddress)
+        this.log.debug('%s: connected', this._currentDc!.ipAddress)
         const initialMessage = await this._packetCodec.tag()
 
         this._socket!.send(initialMessage)
diff --git a/packages/core/src/network/transports/wrapped.ts b/packages/core/src/network/transports/wrapped.ts
index d87b72c0..9f02d50f 100644
--- a/packages/core/src/network/transports/wrapped.ts
+++ b/packages/core/src/network/transports/wrapped.ts
@@ -1,6 +1,7 @@
 import EventEmitter from 'events'
 import { IPacketCodec } from './abstract'
 import { ICryptoProvider } from '../../utils/crypto'
+import { Logger } from '../../utils/logger'
 
 export abstract class WrappedCodec extends EventEmitter {
     protected _crypto!: ICryptoProvider
@@ -20,8 +21,8 @@ export abstract class WrappedCodec extends EventEmitter {
         return this
     }
 
-    setupCrypto(crypto: ICryptoProvider): void {
+    setup(crypto: ICryptoProvider, log: Logger): void {
         this._crypto = crypto
-        this._inner.setupCrypto?.(crypto)
+        this._inner.setup?.(crypto, log)
     }
 }
diff --git a/packages/core/src/storage/abstract.ts b/packages/core/src/storage/abstract.ts
index 3150deaf..6e61c544 100644
--- a/packages/core/src/storage/abstract.ts
+++ b/packages/core/src/storage/abstract.ts
@@ -1,5 +1,6 @@
 import { BasicPeerType, MaybeAsync } from '../types'
 import { tl } from '@mtcute/tl'
+import { Logger } from '../utils/logger'
 
 export namespace ITelegramStorage {
     export interface PeerInfo {
@@ -31,6 +32,12 @@ export namespace ITelegramStorage {
  * write updates to the disk when `save()` is called.
  */
 export interface ITelegramStorage {
+    /**
+     * This method is called before any other.
+     * For storages that use logging, logger instance.
+     */
+    setup?(log: Logger): void
+
     /**
      * Load session from some external storage.
      * Should be used either to load session content from file/network/etc
diff --git a/packages/core/src/utils/logger.ts b/packages/core/src/utils/logger.ts
new file mode 100644
index 00000000..39ad16d7
--- /dev/null
+++ b/packages/core/src/utils/logger.ts
@@ -0,0 +1,115 @@
+import { _defaultLoggingHandler } from './platform/logging'
+
+let defaultLogLevel = 2
+if (typeof process !== 'undefined') {
+    const envLogLevel = parseInt(process.env.MTCUTE_LOG_LEVEL!)
+    if (!isNaN(envLogLevel)) {
+        defaultLogLevel = envLogLevel
+    }
+} else if (typeof localStorage !== 'undefined') {
+    const localLogLevel = parseInt(localStorage.MTCUTE_LOG_LEVEL)
+    if (!isNaN(localLogLevel)) {
+        defaultLogLevel = localLogLevel
+    }
+}
+
+const FORMATTER_RE = /%[a-zA-Z]/g
+
+/**
+ * Logger created by {@link LogManager}
+ */
+export class Logger {
+    private color: number
+
+    constructor(readonly mgr: LogManager, readonly tag: string) {
+        let hash = 0
+
+        for (let i = 0; i < tag.length; i++) {
+            hash = (hash << 5) - hash + tag.charCodeAt(i)
+            hash |= 0 // convert to 32bit int
+        }
+
+        this.color = Math.abs(hash) % 6
+    }
+
+    log(level: number, fmt: string, ...args: any[]): void {
+        if (level > this.mgr.level) return
+
+        // custom formatters
+        if (
+            fmt.indexOf('%h') > -1 ||
+            fmt.indexOf('%b') > -1 ||
+            fmt.indexOf('%j') > -1
+        ) {
+            let idx = 0
+            fmt = fmt.replace(FORMATTER_RE, (m) => {
+                if (m === '%h' || m === '%b' || m === '%j') {
+                    const val = args[idx]
+
+                    args.splice(idx, 1)
+                    if (m === '%h') return val.toString('hex')
+                    if (m === '%b') return !!val + ''
+                    if (m === '%j') return JSON.stringify(val)
+                }
+
+                idx++
+
+                return m
+            })
+        }
+
+        this.mgr.handler(this.color, level, this.tag, fmt, args)
+    }
+
+    readonly error = this.log.bind(this, LogManager.ERROR)
+    readonly warn = this.log.bind(this, LogManager.WARN)
+    readonly info = this.log.bind(this, LogManager.INFO)
+    readonly debug = this.log.bind(this, LogManager.DEBUG)
+    readonly request = this.log.bind(this, LogManager.REQUEST)
+
+    /**
+     * Create a {@link Logger} with the given tag
+     * from the same {@link LogManager} as the current
+     * Logger.
+     *
+     * @param tag  Logger tag
+     */
+    create(tag: string): Logger {
+        return this.mgr.create(tag)
+    }
+}
+
+/**
+ * Log manager.
+ *
+ * Does nothing by itself, but allows managing instance logs
+ */
+export class LogManager {
+    static OFF = 0
+    static ERROR = 1
+    static WARN = 2
+    static INFO = 3
+    static DEBUG = 4
+    static REQUEST = 5
+
+    private _cache: Record<string, Logger> = {}
+
+    level = defaultLogLevel
+    handler = _defaultLoggingHandler
+
+    disable(): void {
+        this.level = 0
+    }
+
+    /**
+     * Create a {@link Logger} with the given tag
+     *
+     * @param tag  Logger tag
+     */
+    create(tag: string): Logger {
+        if (!(tag in this._cache)) {
+            this._cache[tag] = new Logger(this, tag)
+        }
+        return this._cache[tag]
+    }
+}
diff --git a/packages/core/src/utils/platform/logging.ts b/packages/core/src/utils/platform/logging.ts
new file mode 100644
index 00000000..e8ebbdc3
--- /dev/null
+++ b/packages/core/src/utils/platform/logging.ts
@@ -0,0 +1,57 @@
+import { isatty } from 'tty'
+
+const isTty = isatty(process.stdout.fd)
+
+const BASE_FORMAT = isTty ? '[%s] [%s] %s%s\x1b[0m - ' : '[%s] [%s] %s - '
+const LEVEL_NAMES = isTty
+    ? [
+          '', // OFF
+          '\x1b[31mERR\x1b[0m',
+          '\x1b[33mWRN\x1b[0m',
+          '\x1b[34mINF\x1b[0m',
+          '\x1b[36mDBG\x1b[0m',
+          '\x1b[35mREQ\x1b[0m',
+      ]
+    : [
+          '', // OFF
+          'ERR',
+          'WRN',
+          'INF',
+          'DBG',
+          'REQ',
+      ]
+const TAG_COLORS = [6, 2, 3, 4, 5, 1].map((i) => `\x1b[3${i};1m`)
+
+/** @internal */
+export const _defaultLoggingHandler = isTty
+    ? (
+          color: number,
+          level: number,
+          tag: string,
+          fmt: string,
+          args: any[]
+      ): void => {
+          console.log(
+              BASE_FORMAT + fmt,
+              new Date().toISOString(),
+              LEVEL_NAMES[level],
+              TAG_COLORS[color],
+              tag,
+              ...args
+          )
+      }
+    : (
+          color: number,
+          level: number,
+          tag: string,
+          fmt: string,
+          args: any[]
+      ): void => {
+          console.log(
+              BASE_FORMAT + fmt,
+              new Date().toISOString(),
+              LEVEL_NAMES[level],
+              tag,
+              ...args
+          )
+      }
diff --git a/packages/core/src/utils/platform/logging.web.ts b/packages/core/src/utils/platform/logging.web.ts
new file mode 100644
index 00000000..d3e6a42a
--- /dev/null
+++ b/packages/core/src/utils/platform/logging.web.ts
@@ -0,0 +1,46 @@
+const BASE_FORMAT = '[%s] [%с%s%с] %c%s%c - '
+const LEVEL_NAMES = [
+    '', // OFF
+    'ERR',
+    'WRN',
+    'INF',
+    'DBG',
+    'REQ'
+]
+const COLORS = [
+    '', // OFF
+    '#ff0000',
+    '#ffff00',
+    '#0000ff',
+    '#00ffff',
+    '#ff00ff',
+]
+const TAG_COLORS = [
+    '#44ffff',
+    '#44ff44',
+    '#ffff44',
+    '#4444ff',
+    '#ff44ff',
+    '#ff4444',
+]
+
+/** @internal */
+export const _defaultLoggingHandler = (
+    color: number,
+    level: number,
+    tag: string,
+    fmt: string,
+    args: any[]
+): void => {
+    console.log(
+        BASE_FORMAT + fmt,
+        new Date().toISOString(),
+        COLORS[level],
+        LEVEL_NAMES[level],
+        '',
+        TAG_COLORS[color],
+        tag,
+        '',
+        ...args
+    )
+}
diff --git a/packages/dispatcher/package.json b/packages/dispatcher/package.json
index c04e0503..ee98ea8a 100644
--- a/packages/dispatcher/package.json
+++ b/packages/dispatcher/package.json
@@ -15,7 +15,6 @@
         "@mtcute/tl": "~1.131.0",
         "@mtcute/core": "^1.0.0",
         "@mtcute/client": "^1.0.0",
-        "events": "^3.2.0",
-        "debug": "^4.3.1"
+        "events": "^3.2.0"
     }
 }
diff --git a/packages/http-proxy/index.ts b/packages/http-proxy/index.ts
index dacdd68f..0edd8a60 100644
--- a/packages/http-proxy/index.ts
+++ b/packages/http-proxy/index.ts
@@ -7,8 +7,6 @@ import {
 import { connect as connectTcp } from 'net'
 import { connect as connectTls, SecureContextOptions } from 'tls'
 
-const debug = require('debug')('mtcute:http-proxy')
-
 /**
  * An error has occurred while connecting to an HTTP(s) proxy
  */
@@ -105,7 +103,7 @@ export abstract class BaseHttpProxyTcpTransport extends BaseTcpTransport {
     }
 
     private _onProxyConnected() {
-        debug(
+        this.log.debug(
             '[%s:%d] connected to proxy, sending CONNECT',
             this._proxy.host,
             this._proxy.port
@@ -135,7 +133,7 @@ export abstract class BaseHttpProxyTcpTransport extends BaseTcpTransport {
 
         this._socket!.write(packet)
         this._socket!.once('data', (msg) => {
-            debug(
+            this.log.debug(
                 '[%s:%d] CONNECT resulted in: %s',
                 this._proxy.host,
                 this._proxy.port,
diff --git a/packages/http-proxy/package.json b/packages/http-proxy/package.json
index cf0f00b1..3fb31a8d 100644
--- a/packages/http-proxy/package.json
+++ b/packages/http-proxy/package.json
@@ -12,7 +12,6 @@
         "build": "tsc"
     },
     "dependencies": {
-        "@mtcute/core": "^1.0.0",
-        "debug": "^4.3.1"
+        "@mtcute/core": "^1.0.0"
     }
 }
diff --git a/packages/socks-proxy/index.ts b/packages/socks-proxy/index.ts
index e7d676e8..8f468958 100644
--- a/packages/socks-proxy/index.ts
+++ b/packages/socks-proxy/index.ts
@@ -9,8 +9,6 @@ import { connect } from 'net'
 // @ts-ignore
 import { normalize } from 'ip6'
 
-const debug = require('debug')('mtcute:socks-proxy')
-
 /**
  * An error has occurred while connecting to an SOCKS proxy
  */
@@ -234,7 +232,7 @@ export abstract class BaseSocksTcpTransport extends BaseTcpTransport {
                 }
                 const code = msg[1]
 
-                debug(
+                this.log.debug(
                     '[%s:%d] CONNECT returned code %d',
                     this._proxy.host,
                     this._proxy.port,
@@ -259,7 +257,7 @@ export abstract class BaseSocksTcpTransport extends BaseTcpTransport {
                 }
             }
 
-            debug(
+            this.log.debug(
                 '[%s:%d] connected to proxy, sending CONNECT',
                 this._proxy.host,
                 this._proxy.port
@@ -280,7 +278,7 @@ export abstract class BaseSocksTcpTransport extends BaseTcpTransport {
             let state: 'greeting' | 'auth' | 'connect' = 'greeting'
 
             const sendConnect = () => {
-                debug(
+                this.log.debug(
                     '[%s:%d] sending CONNECT',
                     this._proxy.host,
                     this._proxy.port
@@ -317,7 +315,7 @@ export abstract class BaseSocksTcpTransport extends BaseTcpTransport {
 
                         const chosen = msg[1]
 
-                        debug(
+                        this.log.debug(
                             '[%s:%d] GREETING returned auth method %d',
                             this._proxy.host,
                             this._proxy.port,
@@ -386,7 +384,7 @@ export abstract class BaseSocksTcpTransport extends BaseTcpTransport {
                             return
                         }
 
-                        debug(
+                        this.log.debug(
                             '[%s:%d] AUTH returned code %d',
                             this._proxy.host,
                             this._proxy.port,
@@ -421,7 +419,7 @@ export abstract class BaseSocksTcpTransport extends BaseTcpTransport {
 
                         const code = msg[1]
 
-                        debug(
+                        this.log.debug(
                             '[%s:%d] CONNECT returned code %d',
                             this._proxy.host,
                             this._proxy.port,
@@ -451,7 +449,7 @@ export abstract class BaseSocksTcpTransport extends BaseTcpTransport {
                 }
             }
 
-            debug(
+            this.log.debug(
                 '[%s:%d] connected to proxy, sending GREETING',
                 this._proxy.host,
                 this._proxy.port
diff --git a/packages/socks-proxy/package.json b/packages/socks-proxy/package.json
index 00280413..3066b304 100644
--- a/packages/socks-proxy/package.json
+++ b/packages/socks-proxy/package.json
@@ -13,7 +13,6 @@
     },
     "dependencies": {
         "@mtcute/core": "^1.0.0",
-        "ip6": "^0.2.6",
-        "debug": "^4.3.1"
+        "ip6": "^0.2.6"
     }
 }
diff --git a/packages/sqlite/index.ts b/packages/sqlite/index.ts
index 80fb833c..737bdb9a 100644
--- a/packages/sqlite/index.ts
+++ b/packages/sqlite/index.ts
@@ -11,8 +11,7 @@ import { tl } from '@mtcute/tl'
 import sqlite3 from 'better-sqlite3'
 import bigInt from 'big-integer'
 import { throttle } from '@mtcute/core'
-
-const debug = require('debug')('mtcute:sqlite')
+import { Logger } from '@mtcute/core/src/utils/logger'
 
 function serializeAccessHash(hash: tl.Long): Buffer {
     const arr = hash.toArray(256)
@@ -181,6 +180,8 @@ export class SqliteStorage implements ITelegramStorage /*, IStateStorage */ {
     private _vacuumTimeout?: NodeJS.Timeout
     private _vacuumInterval: number
 
+    private log!: Logger
+
     /**
      * @param filename  Database file name, or `:memory:` for in-memory DB
      * @param params
@@ -302,6 +303,10 @@ export class SqliteStorage implements ITelegramStorage /*, IStateStorage */ {
         // todo: add support for workers (idk if really needed, but still)
     }
 
+    setup(log: Logger): void {
+        this.log = log.create('sqlite')
+    }
+
     private _readFullPeer(data: Buffer): tl.TypeUser | tl.TypeChat | null {
         // reuse reader because why not
         this._reader.pos = 0
@@ -368,14 +373,14 @@ export class SqliteStorage implements ITelegramStorage /*, IStateStorage */ {
             // tables already exist, check version
             this._initializeStatements()
             const version = this._getFromKv('ver')
-            debug('current db version = %d', version)
+            this.log.debug('current db version = %d', version)
             if (version < CURRENT_VERSION) {
                 this._upgradeDatabase(version)
                 this._setToKv('ver', CURRENT_VERSION, true)
             }
         } else {
             // create tables
-            debug('creating tables')
+            this.log.debug('creating tables')
             this._db.exec(SCHEMA)
             this._initializeStatements()
             this._setToKv('ver', CURRENT_VERSION, true)
@@ -389,7 +394,7 @@ export class SqliteStorage implements ITelegramStorage /*, IStateStorage */ {
 
     load(): void {
         this._db = sqlite3(this._filename, {
-            verbose: debug.enabled ? debug : null,
+            verbose: this.log.mgr.level === 4 ? this.log.debug : undefined,
         })
 
         this._initialize()
diff --git a/packages/sqlite/package.json b/packages/sqlite/package.json
index ada07aaf..d94f2c30 100644
--- a/packages/sqlite/package.json
+++ b/packages/sqlite/package.json
@@ -15,8 +15,7 @@
         "@mtcute/core": "^1.0.0",
         "@mtcute/tl": "~1.131.0",
         "better-sqlite3": "^7.4.0",
-        "big-integer": "1.6.48",
-        "debug": "^4.3.1"
+        "big-integer": "1.6.48"
     },
     "devDependencies": {
         "@types/sqlite3": "^3.1.7",