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Software · Internet & communication

Threema

Threema for desktop is a desktop client for Threema, a privacy-focused end-to-end encrypted mobile messenger hosted and developed in Switzerland. UNOFFICIAL PACKAGE.

  • Completely free
  • Linux
  • Open source

Overview

Threema is a messaging program, available on Linux.

Features described in its Flathub listing, in its GitHub repository and on its official website: end-to-end encryption.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Threema for desktop is a desktop client for Threema, a privacy-focused end-to-end encrypted mobile messenger hosted and developed in Switzerland.” — Flathub, 10 November 2026
  • “The secure instant messenger from Switzerland.” — official website, 10 November 2026

At a glance

All of Threema is free: no feature is locked behind a paid plan, and its code is open.

Its licence (AGPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • Commercial use allowed

About

This is a COMMUNITY-MAINTAINED UNOFFICIAL Flatpak package. Threema for desktop is a desktop client for Threema, a privacy-focused end-to-end encrypted mobile messenger hosted and developed in Switzerland. With Threema for desktop, you can use Threema on your desktop without compromising security. Threema for desktop currently requires an active connection to Threema installed on a smartphone. The next major update of the desktop app will not only introduce a completely redesigned user interface, it will also be based on a totally new architecture. Thanks to multi-device functionality, version 2.0 will no longer require an active connection to your mobile device.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Last technical check: 6 November 2026
  • Description from Flathub — AppStream (Flathub)

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