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SimpleX ChatKeybase
Free

Free and open source under the AGPL 3.0. The company is funded by investment and…

 Free

Free to install and use.

Windows, macOS, Linux, Android, iOS, Command line Windows, macOS, Linux, Android, iOS
  • No user identifier of any kind, so conversations cannot be correlated by account
  • Double ratchet encryption with an additional layer for the relay servers
  • End-to-end encrypted chat and file storage in one app
  • Teams can be created with anyone, including families and clubs
  • 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
  • Linking public identities from other sites may not suit people who want anonymity
  • Little recent public detail about new features or development pace
Downloadable app Downloadable app
Open source Closed source
License: AGPL-3.0 License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked September 24, 2026

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