head to head · open source
OpenProject vs Fizzy
OpenProject has 16,933 GitHub stars, 3,676 forks, 224 open issues and last shipped yesterday. Fizzy has 8,280 stars, 1,211 forks, 67 open issues and last shipped yesterday. OpenProject leads on adoption by 105% (16,933 vs 8,280 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 | ★ 17K | ★ 8.3K |
| License | GPL-3.0 | Custom / other |
| Written in | Ruby | Ruby |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.7K | ⑂ 1.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenProject if
- You weight community size — 17K 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 We empower teams to achieve great things together for the good of society. OpenProject is a web based open source project management software for teams and organizations that require transparency, flexibility, and data sovereignty. Manage projects, portfolios, products, tasks, bugs, agile workflows, roadmaps, and team collaboration in a single platform. OpenProject can be self hosted and is designed for organizations looking for an open source enterprise ready alternative to tools such as Jira, MS Project, Monday, Asana, YouTrack while maintaining full control over their data and infrastructure…
read the full OpenProject overview →
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 →
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Frequently asked questions
Is OpenProject or Fizzy more popular?
OpenProject has 16,933 GitHub stars and Fizzy has 8,280. 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 (16,933 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.