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0xchat vs Kryfo: catalog facts
0xchat	Kryfo
Free The homepage does not list any price or paid tier.	Free Free and open source under GPL-3.0; optional anonymous backing supports development.
Android, iOS	Android
No phone number or email address needed, only a Nostr private key End-to-end encrypted direct messages and private groups	No phone number or email needed End-to-end encrypted chats and groups
Losing the private key means losing the identity Contacts need a Nostr client to reach you	Pre-alpha and not yet audited Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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