head to head · open source
Zulip vs free4chat
Zulip has 25,929 GitHub stars, 10,263 forks, 2,008 open issues and last shipped 2 days ago. free4chat has 1,185 stars, 166 forks, 1 open issues and last shipped yesterday. Zulip leads on adoption by 2,088% (25,929 vs 1,185 stars). Zulip is written in Python under Apache-2.0; free4chat is written in TypeScript under MIT. Zulip has attracted 40% as many forks as stars, free4chat 14%. free4chat was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (collaboration), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Zulip | free4chat | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 1.2K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-19 | 2026-09-20 |
| Forks | ⑂ 10K | ⑂ 166 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Zulip if
- You weight community size — 26K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick free4chat if
- You want the free4chat feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and free4chat fits your workflow better
About Zulip
Zulip is an open source organized team chat application built on topic based threading, aimed at distributed teams that need live and asynchronous conversation in one place, and it is positioned as an open alternative to Slack.
read the full Zulip overview →
About free4chat
Free4Chat is an MIT licensed, TypeScript system for temporary capability access and collaboration that brings humans and independently running AI agents together in short lived Rooms to exchange realtime context, media, focused Tasks, and artifacts without accounts or a permanent workspace.
read the full free4chat overview →
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Frequently asked questions
Is Zulip or free4chat more popular?
Zulip has 25,929 GitHub stars and free4chat has 1,185. Zulip has the larger community by that measure.
Are Zulip and free4chat free?
Both are open source. Zulip is licensed under Apache-2.0 and free4chat under MIT. Neither carries a licence fee.
What is the difference between Zulip and free4chat?
Zulip is written in Python and free4chat in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Zulip or free4chat?
Choose Zulip if you want the larger community (25,929 stars) or its Apache-2.0 licence terms. Choose free4chat if its feature set, stack or MIT licence fits better. Both are self-hostable.