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Telegram Desktop vs Viber: catalog facts
Telegram Desktop	Viber
Freemium Free to use. Telegram Premium is an optional subscription for larger uploads, faster…	Free Free to download and use for messages and calls.
Windows, macOS, Linux	Android
Official client with published source and build instructions Cloud chats sync instantly across every device you sign in on	Voice and video calls plus group chats Chats sync between mobile and desktop
Ordinary chats are not end-to-end encrypted and Telegram holds the keys Secret chats are not available in the desktop client	Proprietary and centrally run Communities and stickers add clutter for people who only want chat
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Account needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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