Open-source team chat that organizes messages by topic, so conversations don't get buried like in Slack. Good for large or distributed teams.
Open sourceSome learning curve
Free alternative to
Code activity
- Stars
- 26,190
- Forks
- 10,551
- Open issues & PRs
- 2,067
- Last commit
- 1 day ago
- Latest release
- 1 day ago
Details
- Type
- Open source
- License
- Apache-2.0
- Written in
- PythonTypeScriptJavaScriptCSS
- Platforms
- Web · Windows · Mac · Linux · Android · iPhone · Self-hosted
- Ease of use
- Some learning curve

Pros
- Topic-based threads are easy to catch up on
- Self-hosted edition is free and full-featured
Cons
- Topic-based organization takes getting used to
Use Zulip instead of
SlackTopic-based threads so conversations don't get buried.
How is the 90/100 "Health" score calculated?
Dorabot computes it weekly from public GitHub data; it is not a review of software quality: 40 points for code freshness (a commit in the last 30 days earns full points), 25 points for popularity by stars, 20 points for a recent release, 15 points for the ratio of open issues to stars. 80+ is Good, 60–79 Fair, below 60 Weak.
FAQ
Is Zulip free?
Yes. Zulip is open source (Apache-2.0 license) and free for personal and commercial use.
Which platforms does Zulip run on?
Zulip is available for Web, Windows, Mac, Linux, Android, iPhone and self-hosting on your own server.
What can I use Zulip instead of?
Zulip is a free alternative to Slack.
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