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0xchat vs Signal: catalog facts
0xchat	Signal
Free The homepage does not list any price or paid tier.	Free Free; developed by a nonprofit funded by grants and donations
Android, iOS	Android, iOS, Windows, macOS, Linux
No phone number or email address needed, only a Nostr private key End-to-end encrypted direct messages and private groups	End-to-end encryption on every message and call using the open source Signal Protocol No ads, affiliate marketers or tracking
Losing the private key means losing the identity Contacts need a Nostr client to reach you	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
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 20, 2026

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