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Telegram vs Viber: catalog facts
Telegram	Viber
Free The apps are free to download and use.	Free Free to download and use for messages and calls.
Windows, macOS, Linux, Android, iOS	Android
Chats sync across phones and desktop computers Large groups, channels and bot platform	Voice and video calls plus group chats Chats sync between mobile and desktop
Relies on Telegram's central servers Apps are open source but the server software is not published	Proprietary and centrally run Communities and stickers add clutter for people who only want chat
Downloadable app, Hosted service	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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