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Viber vs Zalo: catalog facts
Viber	Zalo
Free Free to download and use for messages and calls.	Free Free to download and use for messaging and calls.
Android	Windows, macOS, Android, iOS
Voice and video calls plus group chats Chats sync between mobile and desktop	Widely used in Vietnam, so most contacts there already have it Messaging and calling in one app
Proprietary and centrally run Communities and stickers add clutter for people who only want chat	Official site is mostly in Vietnamese Closed source, run on the developer's servers
Downloadable app	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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