head to head · open source
Fizzy vs Jantt
Fizzy has 8,283 GitHub stars, 1,212 forks, 67 open issues and last shipped yesterday. Jantt has 6,211 stars, 17 forks, 12 open issues and last shipped 2 days ago. Fizzy leads on adoption by 33% (8,283 vs 6,211 stars). Fizzy is written in Ruby under a custom or non-standard licence; Jantt is written in TypeScript under MIT. Fizzy has attracted 15% as many forks as stars, Jantt 0%. 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 | Jantt | |
|---|---|---|
| GitHub stars | ★ 8.3K | ★ 6.2K |
| License | Custom / other | MIT |
| Written in | Ruby | TypeScript |
| Last push | 2026-11-04 | 2026-11-03 |
| Forks | ⑂ 1.2K | ⑂ 17 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Fizzy if
- You weight community size — 8.3K 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 Jantt if
- You want the Jantt feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Jantt fits your workflow better
About Fizzy
Fizzy This is the source code of Fizzy, the Kanban tracking tool for issues and ideas by 37signals. Running your own Fizzy instance If you want to run your own Fizzy instance, but don't need to change its code, you can use our pre built Docker image. You'll need access to a server on which you can run Docker, and you'll need to configure some options to customize your installation. You can find the details of how to do a Docker based deployment in our Docker deployment guide. If you want more flexibility to customize your Fizzy installation by changing its code, and deploy those changes to your server, then we…
read the full Fizzy overview →
About Jantt
The Declarative JSON Gantt Chart Engine Where human intuition meets declarative AI planning. Turn any declarative JSON document into a high performance, interactive, draggable Gantt chart. Zero runtime dependencies. 100% pure TypeScript. Runs everywhere: Plain HTML, React, Next.js, Node.js CLI, and autonomous AI toolchains. Designed from the ground up for: Autonomous AI Agents & LLMs — Declarative JSON schema contract eliminates UI hallucinations; models generate timeline data with 10x fewer tokens than fragile JSX code. Students, Hobbyists & Creators — Lightweight, beautiful Swiss Noir dark mode, intuitive drag…
read the full Jantt overview →
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Frequently asked questions
Is Fizzy or Jantt more popular?
Fizzy has 8,283 GitHub stars and Jantt has 6,211. Fizzy has the larger community by that measure.
Are Fizzy and Jantt free?
Both are open source. Fizzy has no licence declared in this registry, and Jantt is licensed under MIT. Both are free to self-host.
What is the difference between Fizzy and Jantt?
Fizzy is written in Ruby and Jantt 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 Jantt?
Choose Fizzy if you want the larger community (8,283 stars) or its Custom / other licence terms. Choose Jantt if its feature set, stack or MIT licence fits better. Both are self-hostable.