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LINE vs Zalo: catalog facts
LINE	Zalo
Free Messages and voice and video calls are free.	Free Free to download and use for messaging and calls.
Android, iOS	Windows, macOS, Android, iOS
Free messaging and voice and video calls Widely used in several Asian countries	Widely used in Vietnam, so most contacts there already have it Messaging and calling in one app
Closed source, centrally run service Mostly useful where contacts already use it	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.