Opensource Desktop Implementation of the Threema Crypto Messenger

In plain words

openMittsu is an open source desktop client that implements the Threema encrypted messaging protocol. Developed by blizzard4591, it provides users with an alternative way to access Threema messaging on computers rather than relying solely on the official mobile app. The software is designed for developers and users who prefer open source implementations and want transparency in how their secure communications are handled. It launched in 2016 and is available on GitHub.

written from the facts on this page · September 2026

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