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Signal vs LINE: catalog facts
Signal	LINE
Free Free; developed by a nonprofit funded by grants and donations	Free Messages and voice and video calls are free.
Android, iOS, Windows, macOS, Linux	Android, iOS
End-to-end encryption on every message and call using the open source Signal Protocol No ads, affiliate marketers or tracking	Free messaging and voice and video calls Widely used in several Asian countries
Requires a phone number that can receive an SMS or phone call to register Desktop app requires Signal to be installed on a phone first	Closed source, centrally run service Mostly useful where contacts already use it
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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