Instant messaging smartphone service / From Wikipedia, the free encyclopedia

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Threema is a paid cross-platform encrypted instant messaging app developed by Threema GmbH in Switzerland and launched in 2012. The service operates on a decentralized architecture and offers end-to-end encryption. Users can make voice and video calls, send photos, files, and voice notes, share locations, and make groups. Unlike many other popular secure messaging apps, Threema does not require phone numbers or email address for registration, only a one-time purchase. Threema is available on iOS and Android and has clients for Windows, macOS, Linux, and can be accessed via web browser but requires a mobile app to function.[1]