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WeChat vs Zalo: catalog facts
WeChat	Zalo
Free Free to download and use.	Free Free to download and use for messaging and calls.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
Very large user base, especially in China Chat, calls, social feed and payments in one app	Widely used in Vietnam, so most contacts there already have it Messaging and calling in one app
Closed source and run by a single company Many features go beyond messaging, which makes the app large	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
Not stated if it works offline	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.