Best Open Source Threema Alternative
A curated collection of the 1 best open source and self-hosted alternatives to Threema in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Threema in 2026? The top open-source alternative is Signal — Secure messaging app with state-of-the-art encryption, voice/video calls, group chats, and file sharing. No ads, trackers, or data collection..
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Secure messaging app with state-of-the-art encryption, voice/video calls, group chats, and file sharing. No ads, trackers, or data collection.
Secure messaging app with state-of-the-art encryption, voice/video calls, group chats, and file sharing. No ads, trackers, or data collection.
About Threema
A secure messaging app with end-to-end encryption and no data storage.