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WhatsApp vs Zalo: catalog facts
WhatsApp	Zalo
Free Free to use for personal messaging and calls.	Free Free to download and use for messaging and calls.
Windows, macOS, Android, iOS, Web	Windows, macOS, Android, iOS
End-to-end encrypted messages and calls Available on phones, desktop and the web	Widely used in Vietnam, so most contacts there already have it Messaging and calling in one app
Proprietary and tied to a phone number account Relies on a central service run by the developer	Official site is mostly in Vietnamese Closed source, run on the developer's servers
Downloadable app, Web application	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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