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ThreemaArcaneChat
Paid

A one-time purchase is required. Business plans are separate.

 Free

Free and open source, with no ads, funded by donations.

Windows, macOS, Linux, Android, iOS, Web Android
  • No phone number or email required; the ID is random
  • Apps are open source and the company is based in Switzerland
  • No phone number needed to sign up
  • End-to-end encryption and consent-based contact
  • A one-time purchase is required for each platform
  • Smaller user base than the mainstream encrypted messengers
  • Android only; other platforms must use Delta Chat
  • Maintained mainly by one developer
Downloadable app Downloadable app
Open source Open source
License: AGPL-3.0 License: GPL-3.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 2, 2026

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