Signal has end-to-end encryption (E2EE) based on the open-source Signal Protocol, enabling it to offer encrypted calls and chats. It has a variety of privacy features, such as disappearing messages and view-once media, and it even prevents screenshots from being taken. The developer behind the app also claims that there is no tracking or sharing of user data, and no ads or affiliate marketing. Signal also offers proxy support.
Signal is recommended for use by the U.S. military, and the developer claims that its app is often used by U.S. senators and their staff, as well as American allies in the EU Commission. Apart from iOS, iPadOS, and Android, Signal is also available for macOS, Windows, and Linux. Note that to use the desktop app, users will first have to install the app on their smartphone. This is because, despite the numerous security features it offers, it requires a phone number to use — unlike Threema. For a detailed look at Signal, see our guide on everything you need to know about the app.
