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SignalWire
Free

Free; developed by a nonprofit funded by grants and donations

 Freemium

A limited free personal tier is available. Business plans are paid.

Android, iOS, Windows, macOS, Linux Windows, macOS, Linux, Android, iOS, Web
  • End-to-end encryption on every message and call using the open source Signal Protocol
  • No ads, affiliate marketers or tracking
  • Encrypted group calls and guest rooms aimed at organisations
  • Clients are open source and the server can be self-hosted
  • 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
  • The free personal tier is limited and the focus is on paid business plans
  • Requires an account tied to an email address or phone number
Downloadable app Downloadable app, Hosted service
Open source Open source
License: AGPL-3.0 License: GPL-3.0
Account needed Account needed
Needs internet Not stated if it works offline

Checked September 20, 2026

Checked September 22, 2026

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