This is the complete source code and the build instructions for the alpha version of the official desktop client for the Telegram messenger, based on the Telegram API and the MTProto secure protocol.

The source code is published under GPLv3 with OpenSSL exception, the license is available here.

The latest version is available for

• Windows 7 and above (portable)
• macOS 10.12 and above
• OS X 10.10 and 10.11
• Linux static build for 64 bit (32 bit)
• Snap
• Flatpak

Version 1.8.15 was the last that supports older systems

• Windows XP and Vista (portable)
• OS X 10.8 and 10.9
• OS X 10.6 and 10.7

• Qt 5.12.8, 5.6.2 and 5.3.2 slightly patched (LGPL)
• OpenSSL 1.1.1 and 1.0.1 (OpenSSL License)
• WebRTC (New BSD License)
• zlib 1.2.11 (zlib License)
• LZMA SDK 9.20 (public domain)
• liblzma (public domain)
• Google Breakpad (License)
• Google Crashpad (Apache License 2.0)
• GYP (BSD License)
• Ninja (Apache License 2.0)
• OpenAL Soft (LGPL)
• Opus codec (BSD License)
• FFmpeg (LGPL)
• Guideline Support Library (MIT License)
• Range-v3 (Boost License)
• Open Sans font (Apache License 2.0)
• Vazir font (License)
• Emoji alpha codes (MIT License)
• Catch test framework (Boost License)
• xxHash (BSD License)
• QR Code generator (MIT License)
• CMake (New BSD License)
• Hunspell (GPL)

• Visual Studio 2019
• Xcode 11
• CMake on GNU/Linux