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Telegram Desktop vs Mercurygram: catalog facts
Telegram Desktop	Mercurygram
Freemium Free to use. Telegram Premium is an optional subscription for larger uploads, faster…	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Linux, Android
Official client with published source and build instructions Cloud chats sync instantly across every device you sign in on	Based on the official Telegram Desktop code Privacy-focused changes on top of upstream
Ordinary chats are not end-to-end encrypted and Telegram holds the keys Secret chats are not available in the desktop client	Still relies on Telegram's servers and account system Small project compared with the official client
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
Account needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.