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ChantyZulip
Freemium

Free to start, with paid plans listed on the pricing page.

 Freemium

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

Web Windows, macOS, Linux, Android
  • Free guest access for external contacts
  • States HIPAA, GDPR and SOC 2 Type II compliance
  • Topic-based threading inside channels, which makes catching up genuinely practical
  • Self-hostable, or hosted, with free plans for open-source communities
  • Proprietary hosted service only
  • Growing focus on AI agents may not suit everyone
  • 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, Web application, Hosted service Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Account needed Account needed
Needs internet Needs internet

Checked September 24, 2026

Checked September 21, 2026

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