Signal
Signal, run by the nonprofit Signal Technology Foundation and Signal Messenger LLC, makes an end-to-end encrypted messaging and calling app for mobile and desktop. The service is free to use and the desktop client source code is published under the GNU AGPLv3.
Licensing at a Glance
- Open source
- Freeware
Signal Desktop is licensed under the GNU AGPLv3 (copyright Signal Messenger, LLC).[1]
Signal's terms grant users a limited, revocable, non-exclusive and non-transferable licence to use its services in accordance with the terms.[2]
Signal describes itself as a nonprofit with no ads or trackers, supported by donations; Signal Technology Foundation is a nonprofit under section 501c3 of the US Internal Revenue Code.[3]
Users own the information they submit through the services and must have the rights to the phone number used to sign up.[4]
Products
- Signal DesktopVideo Communications Software
- Signal (Android and iOS)Video Communications Software
References
- GitHub - signalapp/Signal-Desktop: A private messenger for Windows, macOS, and Linux. · github.com · retrieved 2026-09-27
- Signal >> Terms of Service & Privacy Policy · signal.org · effective 2018-05-25 · retrieved 2026-09-27
- Signal >> Donate to Signal Private Messenger · signal.org · retrieved 2026-09-27
- Signal >> Terms of Service & Privacy Policy · signal.org · effective 2018-05-25 · retrieved 2026-09-27