aTalk

aTalk is an XMPP client that supports the following features:

* Instant messaging in plain text and End-to-End encryption with OMEMO
* SSL Certificate authentication, DNSSEC and DANE Security implementation for enhanced secure connection establishment
* OMEMO encryption in group chat session enhancing privacy and security
* OMEMO Media File Sharing for all files including Stickers, Bitmoji and Emoji rich contents
* Support http file upload for file sharing with offline contact and in group chat
* Support Stickers, Bitmoji and Emoji rich content sharing via Google Gboard
* Send and receive files for all document types and images with thumbnail preview and gif animation
* Auto accept file transfer with max file size option
* Implement fault-tolerance file transfer algorithm, via Jingle File Transfer, Legacy In-Band/SOCK5 Bytestreams and HttpFileUpload protocols to ease and enhance file sharing reliability
* Enhance and harmonize UI for file sharing in chat and chatRoom
* Support share, quote and forward of messages and media with previews prior to sending
* Support multi-instances of audio media player with functions: Play, Pause, Resume, Stop and Seek
* Support unread message badges in contact and chatRoom list views
* User selectable option for heads-up notification and quite hours
* Share of social media links are tagged with thumbnail and title
* Support Text to Speech and speech recognition UI with enable option per chat session (contact and group chat)
* XEP-0012: Last Activity time associated with contacts
* XEP-0048: Bookmarks for conference room and autoJoin on login
* XEP-0070: Verifying HTTP Requests via XMPP entity for user authentication without password entry
* XEP-0071: XHTML-IM Support chat messages containing lightweight text markup
* XEP-0085: Chat State Notifications
* XEP-0124: Bidirectional-streams Over Synchronous HTTP (BOSH) with Proxy support
* XEP-0178: Use of SASL EXTERNAL with TLS Certificates for client authentication
* XEP-0184: Message Delivery Receipts with user enable/disable option
* XEP-0215: External Service Discovery
* XEP-0251: Jingle Session Transfer: Support both Unattended and Attended call transfer
* XEP-0391: Jingle Encrypted Transports for OMEMO encrypted media file sharing
* Implement call waiting to accept a second incoming call by placing the in-progress call on hold; and allow switching between calls
* Implement Jabber VoIP-PBX gateway Telephony, allowing PBX phone call via service gateway
* Join or create room with full room configuration support for owner
* Integrated captcha protected room user interface with retry on failure
* Support both voice and video call with ZRTP, SDES and DTLS SRTP encryption modes
* ZRTP crypto algorithms uses SHA-2 384, 256bit ciphers AES256 & TWOFISH-256, enabling elliptic with Curve 25519
* SDES encryption with AES256 and AES192, acceleration using OpenSSL
* Support simultaneous media call and message chat sessions
* Unique GPS-Location implementation as standalone tool, send locations to your desired buddy for real-time tracking or playback animation
* A 360° street view of your current location use for self-guided tour. The street view tracks and follows your direction of sight
* Built-in demo for GPS-Location features
* Integrated photo editor with zooming and cropping, user can update the avatar with ease
* Last message correction, message carbons and offline messages (OMEMO)
* Stream Management and mobile network ping interval self-tune optimization support
* In-Band Registration with captcha option support
* Multiple accounts creation
* User selectable Themes support
* Multi-language UI support (Bahasa Indonesia, English, German, Portuguese, Russian, Slovak and Spanish)

Is aTalk free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does aTalk require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is aTalk safe to install?
We link to the exact APK published by Eng ChongMeng. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update aTalk?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

1. Tap the Download APK button above and save the file to your device.
2. Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
3. Open the downloaded org.atalk.android.apk file from your Downloads folder.
4. Tap Install and wait for Android to finish.
5. Open «aTalk» by Eng ChongMeng and grant only the permissions it actually needs.
6. Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.