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signal-cliSimpleX Chat
Free

The open-source software is available without a license fee. Hosting, hardware and…

 Free

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

Windows, macOS, Linux, Command line Windows, macOS, Linux, Android, iOS, Command line
  • Provides a daemon interface for notification integrations.
  • No user identifier of any kind, so conversations cannot be correlated by account
  • Double ratchet encryption with an additional layer for the relay servers
  • Requires a registered or linked Signal account.
  • 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
Open source Open source
License: GPL-3.0 License: AGPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 21, 2026

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