head to head · open source
Fizzy vs paca
Fizzy has 8,283 GitHub stars, 1,212 forks, 67 open issues and last shipped yesterday. paca has 2,024 stars, 185 forks, 8 open issues and last shipped yesterday. Fizzy leads on adoption by 309% (8,283 vs 2,024 stars). Fizzy is written in Ruby under a custom or non-standard licence; paca is written in Go under Apache-2.0. Fizzy has attracted 15% as many forks as stars, paca 9%. paca was the more recently maintained of the two, and both are self-hostable with no licence fee.
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 | paca | |
|---|---|---|
| GitHub stars | ★ 8.3K | ★ 2.0K |
| License | Custom / other | Apache-2.0 |
| Written in | Ruby | Go |
| Last push | 2026-11-04 | 2026-11-04 |
| Forks | ⑂ 1.2K | ⑂ 185 |
| 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 paca if
- You want the paca feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and paca 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 paca
Paca AI native. Free. Lightweight. Open source. The fully customizable alternative to Jira, Trello, ClickUp, and Monday. ✨ Sponsored by Getting Started · MCP Server · Paca Skills · Architecture · Contributing · Roadmap What is Paca? Paca is a self hosted project management platform where AI agents and humans collaborate as equal teammates inside a Scrum team — not as chatbots bolted on the side. Jira gives you a backlog. ClickUp gives you automations. Monday gives you dashboards. Paca gives your AI agents a seat at the table. They join sprint planning, pick up tasks from the board, write BDD specs, and adapt…
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Frequently asked questions
Is Fizzy or paca more popular?
Fizzy has 8,283 GitHub stars and paca has 2,024. Fizzy has the larger community by that measure.
Are Fizzy and paca free?
Both are open source. Fizzy has no licence declared in this registry, and paca is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Fizzy and paca?
Fizzy is written in Ruby and paca in Go. 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 paca?
Choose Fizzy if you want the larger community (8,283 stars) or its Custom / other licence terms. Choose paca if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.