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