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Synology ChatThreema Work
Free

License-free, but it requires a Synology NAS to host the server.

 Paid

Paid business licences, with a 30-day free trial.

Windows, macOS, Linux, Android, iOS, Web, Self-hosted macOS
  • Messages stay on your own NAS
  • Optional end-to-end encryption for conversations or channels
  • End-to-end encrypted messaging for business use
  • Focus on data protection and compliance
  • Only runs on Synology NAS hardware
  • Closed source
  • Paid licences aimed at organisations, not individuals
  • Separate from the consumer Threema app
Downloadable app, Web application, Self-hosted Downloadable app
Closed source Closed source
License not stated License not stated
Account needed Not stated if an account is needed
Not stated if it works offline Needs internet

Checked October 1, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.