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Signal vs 0xchat: catalog facts
Signal	0xchat
Free Free; developed by a nonprofit funded by grants and donations	Free The homepage does not list any price or paid tier.
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	No phone number or email address needed, only a Nostr private key End-to-end encrypted direct messages and private groups
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	Losing the private key means losing the identity Contacts need a Nostr client to reach you
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Account needed	No account 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 1, 2026

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