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TrillianZulip
Freemium

Free for individuals, with paid plans for businesses and healthcare.

 Freemium

The server and clients are free and open source and can be self-hosted at no cost. Zulip…

Windows, macOS, Linux, Android, iOS Windows, macOS, Linux, Android
  • Apps for all major desktop and mobile platforms
  • HIPAA-compliant plans for healthcare use
  • Topic-based threading inside channels, which makes catching up genuinely practical
  • Self-hostable, or hosted, with free plans for open-source communities
  • Proprietary and closed source
  • Business and healthcare features require a paid plan
  • The topic model takes getting used to and needs team discipline to work
  • The desktop client shares most of its code with the web app, so it inherits its quirks
Downloadable app, Hosted service Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Account needed Account needed
Needs internet Needs internet

Checked October 1, 2026

Checked September 21, 2026

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