head to head · open source
Fizzy vs nimbalyst
Fizzy has 8,283 GitHub stars, 1,212 forks, 67 open issues and last shipped yesterday. nimbalyst has 2,020 stars, 328 forks, 642 open issues and last shipped 2 days ago. Fizzy leads on adoption by 310% (8,283 vs 2,020 stars). Fizzy is written in Ruby under a custom or non-standard licence; nimbalyst is written in TypeScript under MIT. Fizzy has attracted 15% as many forks as stars, nimbalyst 16%. 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 | nimbalyst | |
|---|---|---|
| GitHub stars | ★ 8.3K | ★ 2.0K |
| License | Custom / other | MIT |
| Written in | Ruby | TypeScript |
| Last push | 2026-11-04 | 2026-11-03 |
| Forks | ⑂ 1.2K | ⑂ 328 |
| 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 nimbalyst if
- You want the nimbalyst feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and nimbalyst 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 nimbalyst
Nimbalyst: Open source visual workspace for building with Codex, Claude Code, OpenCode, and other coding agents. Work on everything in one place: sessions, worktrees, tasks, docs, diagrams, mockups, commits, and code. Visually editable. Deeply linked. Free and MIT licensed. Desktop app for macOS, Windows, and Linux, with an iOS companion app. Website · Download · Documentation · Discord What you get Visual editing of the agent's work. WYSIWYG editors for markdown, mockups, Mermaid, Excalidraw, CSV, data models, and code in Monaco. You and the coding agent edit the same files. Red/green diff review. Step through…
read the full nimbalyst overview →
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Frequently asked questions
Is Fizzy or nimbalyst more popular?
Fizzy has 8,283 GitHub stars and nimbalyst has 2,020. Fizzy has the larger community by that measure.
Are Fizzy and nimbalyst free?
Both are open source. Fizzy has no licence declared in this registry, and nimbalyst is licensed under MIT. Both are free to self-host.
What is the difference between Fizzy and nimbalyst?
Fizzy is written in Ruby and nimbalyst 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 nimbalyst?
Choose Fizzy if you want the larger community (8,283 stars) or its Custom / other licence terms. Choose nimbalyst if its feature set, stack or MIT licence fits better. Both are self-hostable.