head to head · open source
OpenProject vs calcure
OpenProject has 16,933 GitHub stars, 3,676 forks, 224 open issues and last shipped yesterday. calcure has 2,395 stars, 77 forks, 6 open issues and last shipped 9 days ago. OpenProject leads on adoption by 607% (16,933 vs 2,395 stars). OpenProject is written in Ruby under GPL-3.0; calcure is written in Python under MIT. OpenProject has attracted 22% as many forks as stars, calcure 3%. 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 | calcure | |
|---|---|---|
| GitHub stars | ★ 17K | ★ 2.4K |
| License | GPL-3.0 | MIT |
| Written in | Ruby | Python |
| Last push | 2026-11-02 | 2026-10-25 |
| Forks | ⑂ 3.7K | ⑂ 77 |
| 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 calcure if
- You want the calcure feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and calcure 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 calcure
Calcure Modern TUI calendar and task manager with customizable interface. Manages your events and tasks, displays birthdays from your abook, and can import events and tasks from calcurse. See documentation for more information. Features Vim keys View tasks and events from .ics files synced with clouds Operation with fewest key presses possible Todo list with subtasks, deadlines, and timers Birthdays of your abook contacts Import of events and tasks from calcurse Icons according to the name ✈ ⛷ ⛱ Private events and tasks ••••• Plain text database in your folder for cloud sync Customizable colors, icons, and other…
read the full calcure overview →
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Frequently asked questions
Is OpenProject or calcure more popular?
OpenProject has 16,933 GitHub stars and calcure has 2,395. OpenProject has the larger community by that measure.
Are OpenProject and calcure free?
Both are open source. OpenProject is licensed under GPL-3.0 and calcure under MIT. Neither carries a licence fee.
What is the difference between OpenProject and calcure?
OpenProject is written in Ruby and calcure in Python. 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 calcure?
Choose OpenProject if you want the larger community (16,933 stars) or its GPL-3.0 licence terms. Choose calcure if its feature set, stack or MIT licence fits better. Both are self-hostable.