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Messenger vs Viber: catalog facts
Messenger	Viber
Free Free to use with a Meta account.	Free Free to download and use for messages and calls.
Web	Android
Reaches people who already use Facebook Messaging and video calls in one place	Voice and video calls plus group chats Chats sync between mobile and desktop
Requires a Meta account Closed source and run by an advertising company	Proprietary and centrally run Communities and stickers add clutter for people who only want chat
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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