Compare software

imo vs Viber: catalog facts
imo	Viber
Free Free to download and use.	Free Free to download and use for messages and calls.
Windows, macOS, Android, iOS	Android
Audio and video calls on mobile and desktop Built-in message translation	Voice and video calls plus group chats Chats sync between mobile and desktop
Proprietary and closed source Limited technical detail published about its encryption	Proprietary and centrally run Communities and stickers add clutter for people who only want chat
Downloadable app	Downloadable app
Closed source	Closed source
License: Proprietary	License not stated
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 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.