Threema is an instant messaging app from Switzerland with apps for iOS, Android, Windows, macOS and Linux. Communication is end to end encrypted, and the apps are open source, so the encryption can be reviewed by anyone rather than taken on trust.
The company is Swiss, which keeps the service outside US jurisdiction, and the one off purchase price means the app is not funded by advertising. It is a European alternative to the US messengers for people and organisations that want encrypted communication from an inspectable codebase.
Pricing
Threema costs EUR 3.99 as a one off purchase in the App Store and Play Store.
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