head to head · open source
OpenProject vs invobook
OpenProject has 16,132 GitHub stars, 3,486 forks, 224 open issues and last shipped yesterday. invobook has 2,235 stars, 609 forks, 9 open issues and last shipped 10 months ago. OpenProject leads on adoption by 622% (16,132 vs 2,235 stars). OpenProject is written in Ruby under GPL-3.0; invobook is written in PHP under MIT. OpenProject has attracted 22% as many forks as stars, invobook 27%. OpenProject 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
| OpenProject | invobook | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 2.2K |
| License | GPL-3.0 | MIT |
| Written in | Ruby | PHP |
| Last push | 2026-09-17 | 2025-11-12 |
| Forks | ⑂ 3.5K | ⑂ 609 |
| 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 invobook if
- You want the invobook feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches PHP
- You evaluated both and invobook 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 invobook
InvoBook is a self hosted business application for time tracking, invoice generation, project management, and client management. It is written in PHP and built with Laravel and Filament, placing it in the Laravel ecosystem and the TALL stack. The project is distributed under the MIT license, and the repository metadata lists a ten year age and a last push on 2025 11 12.
read the full invobook overview →
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Frequently asked questions
Is OpenProject or invobook more popular?
OpenProject has 16,132 GitHub stars and invobook has 2,235. OpenProject has the larger community by that measure.
Are OpenProject and invobook free?
Both are open source. OpenProject is licensed under GPL-3.0 and invobook under MIT. Neither carries a licence fee.
What is the difference between OpenProject and invobook?
OpenProject is written in Ruby and invobook in PHP. 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 invobook?
Choose OpenProject if you want the larger community (16,132 stars) or its GPL-3.0 licence terms. Choose invobook if its feature set, stack or MIT licence fits better. Both are self-hostable.