head to head · open source
Fizzy vs KaibanJS
Fizzy has 8,212 GitHub stars, 1,194 forks, 67 open issues and last shipped yesterday. KaibanJS has 1,479 stars, 158 forks, 78 open issues and last shipped 4 months ago. Fizzy leads on adoption by 455% (8,212 vs 1,479 stars). Fizzy is written in Ruby under a custom or non-standard licence; KaibanJS is written in TypeScript under MIT. Fizzy has attracted 15% as many forks as stars, KaibanJS 11%. Fizzy was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (kanban), 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
| Fizzy | KaibanJS | |
|---|---|---|
| GitHub stars | ★ 8.2K | ★ 1.5K |
| License | Custom / other | MIT |
| Written in | Ruby | TypeScript |
| Last push | 2026-09-19 | 2026-05-15 |
| Forks | ⑂ 1.2K | ⑂ 158 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Fizzy if
- You weight community size — 8.2K stars and counting
- You want the Custom / other license terms
- Your stack matches Ruby
- You value the larger contributor base for long-term maintenance
pick KaibanJS if
- You want the KaibanJS feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and KaibanJS fits your workflow better
About Fizzy
Fizzy is an open source kanban tool for tracking issues and ideas, published by 37signals as a Ruby on Rails application, and it is aimed at teams that want a fast, simple board together with the source code and the option to run that board on their own server.
read the full Fizzy overview →
About KaibanJS
KaibanJS is an MIT licensed, TypeScript written JavaScript native framework for building and managing multi agent systems with a Kanban inspired approach. It lives in the JavaScript ecosystem and provides a way to create, visualize, and coordinate AI agents, tasks, tools, and teams.
read the full KaibanJS overview →
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Frequently asked questions
Is Fizzy or KaibanJS more popular?
Fizzy has 8,212 GitHub stars and KaibanJS has 1,479. Fizzy has the larger community by that measure.
Are Fizzy and KaibanJS free?
Both are open source. Fizzy has no licence declared in this registry, and KaibanJS is licensed under MIT. Both are free to self-host.
What is the difference between Fizzy and KaibanJS?
Fizzy is written in Ruby and KaibanJS 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, Fizzy or KaibanJS?
Choose Fizzy if you want the larger community (8,212 stars) or its Custom / other licence terms. Choose KaibanJS if its feature set, stack or MIT licence fits better. Both are self-hostable.