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Viber vs imo: catalog facts
Viber	imo
Free Free to download and use for messages and calls.	Free Free to download and use.
Android	Windows, macOS, Android, iOS
Voice and video calls plus group chats Chats sync between mobile and desktop	Audio and video calls on mobile and desktop Built-in message translation
Proprietary and centrally run Communities and stickers add clutter for people who only want chat	Proprietary and closed source Limited technical detail published about its encryption
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: Proprietary
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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