Compare software

PumbleZulip
Freemium

Free with unlimited users and message history; paid plans are sold for businesses.

 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
  • Unlimited users and message history on the free offering
  • Channels, threads, calls and recording in one app
  • Topic-based threading inside channels, which makes catching up genuinely practical
  • Self-hostable, or hosted, with free plans for open-source communities
  • Hosted service only, with no self-hosting option
  • Closed source
  • 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
Not stated if it works offline Needs internet

Checked September 24, 2026

Checked September 21, 2026

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