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Signal vs ArcaneChat: catalog facts
Signal	ArcaneChat
Free Free; developed by a nonprofit funded by grants and donations	Free Free and open source, with no ads, funded by donations.
Android, iOS, Windows, macOS, Linux	Android
End-to-end encryption on every message and call using the open source Signal Protocol No ads, affiliate marketers or tracking	No phone number needed to sign up End-to-end encryption and consent-based contact
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	Android only; other platforms must use Delta Chat Maintained mainly by one developer
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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