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Threema Web

An intuitive and secure web client for Threema users

File Sync & Storage ★ 1.1k stars Easy setup free

📱 Threema Web is a secure and convenient way to use the Threema messaging app directly from a web browser while maintaining full end-to-end encryption. By scanning a QR code with the Threema app, users establish a direct connection between their smartphone and computer, ensuring that no messages or metadata are stored on external servers. The communication is handled via WebRTC, which enables a private and encrypted peer-to-peer connection. With Threema Web, users can send and receive messages, share images and files, and manage conversations with the comfort of a full-sized keyboard and large.

Official siteSource code

Strengths

  • Easy to set up — beginner-friendly
  • First-class Docker support for quick deployment
  • One-click install on common self-host platforms
  • Active community (1.1k GitHub stars)

Is Threema Web secure?

OSV.dev has no published security advisories for Threema Web's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Health badge

Maintain Threema Web? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 82 · excellent

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[![SelfHostIndex health score for Threema Web](https://selfhostindex.com/badge/threema.svg)](https://selfhostindex.com/app/threema/)
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<a href="https://selfhostindex.com/app/threema/"><img src="https://selfhostindex.com/badge/threema.svg" alt="SelfHostIndex health score for Threema Web"></a>
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   :alt: SelfHostIndex health score for Threema Web
   :target: https://selfhostindex.com/app/threema/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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