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KakaoTalk vs Viber: catalog facts
KakaoTalk	Viber
Free Free to use for messaging and calls.	Free Free to download and use for messages and calls.
Windows	Android
Free messaging plus voice and video calls Chat folders and editable sent messages	Voice and video calls plus group chats Chats sync between mobile and desktop
Official information is mostly in Korean Includes social and short-form video features beyond plain messaging	Proprietary and centrally run Communities and stickers add clutter for people who only want chat
Downloadable app	Downloadable app
Closed source	Closed source
License: Proprietary	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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