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0xchat vs SimpleX Chat: catalog facts
0xchat	SimpleX Chat
Free The homepage does not list any price or paid tier.	Free Free and open source under the AGPL 3.0. The company is funded by investment and…
Android, iOS	Windows, macOS, Linux, Android, iOS, Command line
No phone number or email address needed, only a Nostr private key End-to-end encrypted direct messages and private groups	No user identifier of any kind, so conversations cannot be correlated by account Double ratchet encryption with an additional layer for the relay servers
Losing the private key means losing the identity Contacts need a Nostr client to reach you	Connecting means exchanging a link or QR code in person or elsewhere No contact list means a lost device is a lost set of conversations unless backed up
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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