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Zalo vs KakaoTalk: catalog facts
Zalo	KakaoTalk
Free Free to download and use for messaging and calls.	Free Free to use for messaging and calls.
Windows, macOS, Android, iOS	Windows
Widely used in Vietnam, so most contacts there already have it Messaging and calling in one app	Free messaging plus voice and video calls Chat folders and editable sent messages
Official site is mostly in Vietnamese Closed source, run on the developer's servers	Official information is mostly in Korean Includes social and short-form video features beyond plain messaging
Downloadable app, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License: Proprietary
Not stated if an account is needed	Not stated if an account is 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 October 2, 2026

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