head to head · open source
OpenProject vs Jantt
OpenProject has 16,487 GitHub stars, 3,572 forks, 224 open issues and last shipped today. Jantt has 1,864 stars, 5 forks, 12 open issues and last shipped 4 days ago. OpenProject leads on adoption by 784% (16,487 vs 1,864 stars). OpenProject is written in Ruby under GPL-3.0; Jantt is written in TypeScript under MIT. OpenProject has attracted 22% as many forks as stars, Jantt 0%. OpenProject was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (gantt, gantt-chart, 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 | Jantt | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 1.9K |
| License | GPL-3.0 | MIT |
| Written in | Ruby | TypeScript |
| Last push | 2026-10-20 | 2026-10-16 |
| Forks | ⑂ 3.6K | ⑂ 5 |
| 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 Jantt if
- You want the Jantt feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Jantt 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 Jantt
The Declarative JSON Gantt Chart Engine Where human intuition meets declarative AI planning. Turn any declarative JSON document into a high performance, interactive, draggable Gantt chart. Zero runtime dependencies. 100% pure TypeScript. Runs everywhere: Plain HTML, React, Next.js, Node.js CLI, and autonomous AI toolchains. Designed from the ground up for: Autonomous AI Agents & LLMs — Declarative JSON schema contract eliminates UI hallucinations; models generate timeline data with 10x fewer tokens than fragile JSX code. Students, Hobbyists & Creators — Lightweight, beautiful Swiss Noir dark mode, intuitive drag…
read the full Jantt overview →
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Frequently asked questions
Is OpenProject or Jantt more popular?
OpenProject has 16,487 GitHub stars and Jantt has 1,864. OpenProject has the larger community by that measure.
Are OpenProject and Jantt free?
Both are open source. OpenProject is licensed under GPL-3.0 and Jantt under MIT. Neither carries a licence fee.
What is the difference between OpenProject and Jantt?
OpenProject is written in Ruby and Jantt in TypeScript. 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 Jantt?
Choose OpenProject if you want the larger community (16,487 stars) or its GPL-3.0 licence terms. Choose Jantt if its feature set, stack or MIT licence fits better. Both are self-hostable.