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QuicallThreema
Free

Free to download, with source published under the AGPL.

 Paid

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

Windows, macOS, Linux, Android, iOS Windows, macOS, Linux, Android, iOS, Web
  • Chat, voice and video calls in one app
  • Clients for mobile and desktop platforms
  • No phone number or email required; the ID is random
  • Apps are open source and the company is based in Switzerland
  • Branding is inconsistent across the website, app and repository
  • Small project with little public documentation
  • A one-time purchase is required for each platform
  • Smaller user base than the mainstream encrypted messengers
Downloadable app Downloadable app
Open source Open source
License: AGPL-3.0-or-later License: AGPL-3.0
Not stated if an account is needed Not stated if an account is needed
Needs internet Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

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