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Mercurygram vs Telegram A: catalog facts
Mercurygram	Telegram A
Free Free and open source under the GPL-3.0-or-later licence.	Free Free to use with a Telegram account.
Linux, Android	macOS, Web
Based on the official Telegram Desktop code Privacy-focused changes on top of upstream	Official Telegram client Works in a browser with nothing to install
Still relies on Telegram's servers and account system Small project compared with the official client	Requires a Telegram account Little documentation on how it differs from Telegram Desktop
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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