head to head · open source
OpenProject vs Fizzy
OpenProject has 16,132 GitHub stars, 3,486 forks, 224 open issues and last shipped yesterday. Fizzy has 8,202 stars, 1,193 forks, 67 open issues and last shipped 2 days ago. OpenProject leads on adoption by 97% (16,132 vs 8,202 stars). OpenProject is written in Ruby under GPL-3.0; Fizzy is written in Ruby under a custom or non-standard licence. OpenProject has attracted 22% as many forks as stars, Fizzy 15%. OpenProject 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
| OpenProject | Fizzy | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 8.2K |
| License | GPL-3.0 | Custom / other |
| Written in | Ruby | Ruby |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 3.5K | ⑂ 1.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenProject if
- You weight community size — 16K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Ruby
- You value the larger contributor base for long-term maintenance
pick Fizzy if
- You want the Fizzy feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Ruby
- You evaluated both and Fizzy fits your workflow better
About OpenProject
OpenProject is a web based open source project management software for teams and organizations that need transparency, flexibility, and data sovereignty. It lives in the open source project management ecosystem, with Ruby as the repository language and Angular as a listed topic. The project is positioned as an open alternative to Asana and Basecamp, and the README also compares it with Jira, MS Project, Monday, and YouTrack.
read the full OpenProject overview →
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 →
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Frequently asked questions
Is OpenProject or Fizzy more popular?
OpenProject has 16,132 GitHub stars and Fizzy has 8,202. OpenProject has the larger community by that measure.
Are OpenProject and Fizzy free?
Both are open source. OpenProject is licensed under GPL-3.0, and Fizzy has no licence declared in this registry. Both are free to self-host.
What is the difference between OpenProject and Fizzy?
OpenProject is written in Ruby and Fizzy in Ruby. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenProject or Fizzy?
Choose OpenProject if you want the larger community (16,132 stars) or its GPL-3.0 licence terms. Choose Fizzy if its feature set, stack or Custom / other licence fits better. Both are self-hostable.