head to head · open source
luigi vs ical4j
luigi has 18,782 GitHub stars, 2,474 forks, 175 open issues and last shipped 20 days ago. ical4j has 841 stars, 225 forks, 162 open issues and last shipped 3 days ago. luigi leads on adoption by 2,133% (18,782 vs 841 stars). luigi is written in Python under Apache-2.0; ical4j is written in Java under BSD-3-Clause. luigi has attracted 13% as many forks as stars, ical4j 27%. ical4j was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (scheduling), 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
| luigi | ical4j | |
|---|---|---|
| GitHub stars | ★ 19K | ★ 841 |
| License | Apache-2.0 | BSD-3-Clause |
| Written in | Python | Java |
| Last push | 2026-10-14 | 2026-10-31 |
| Forks | ⑂ 2.5K | ⑂ 225 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick luigi if
- You weight community size — 19K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick ical4j if
- You want the ical4j feature set and don't need the biggest community
- You prefer the BSD-3-Clause license terms
- Your stack matches Java
- You evaluated both and ical4j fits your workflow better
About luigi
.. figure:: :alt: Luigi Logo :align: center .. image:: :target: .. image:: :target: .. image:: :target: .. image:: :target: .. image:: :target: :alt: Documentation Status Luigi is a Python (3.10, 3.11, 3.12, 3.13, 3.14 tested) package that helps you build complex pipelines of batch jobs. It handles dependency resolution, workflow management, visualization, handling failures, command line integration, and much more. Getting Started Run pip install luigi to install the latest stable version from PyPI . Documentation for the latest release is hosted on readthedocs. Run pip install luigi[toml] to install Luigi with…
read the full luigi overview →
About ical4j
iCal4j iCalendar parser and object model [RFC2445]: [RFC2446]: [RFC2447]: [RFC5545]: [RFC5546]: [RFC6047]: [RFC6868]: [RFC7808]: [RFC7953]: [RFC7986]: [RFC7529]: [RFC9073]: [RFC9074]: [RFC9253]: [mavenrepo]: [Java Legacy Date Time Code]: [Introduction]: introduction [Setup]: setup [System requirements]: system requirements [Release downloads]: release downloads [Install with Maven]: install with maven [Install with Gradle]: install with gradle [Usage]: usage [Examples]: examples [References]: references [Specifications]: specifications [Configuration]: configuration [Compatibility Hints]: compatibility hints…
read the full ical4j overview →
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Frequently asked questions
Is luigi or ical4j more popular?
luigi has 18,782 GitHub stars and ical4j has 841. luigi has the larger community by that measure.
Are luigi and ical4j free?
Both are open source. luigi is licensed under Apache-2.0 and ical4j under BSD-3-Clause. Neither carries a licence fee.
What is the difference between luigi and ical4j?
luigi is written in Python and ical4j in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, luigi or ical4j?
Choose luigi if you want the larger community (18,782 stars) or its Apache-2.0 licence terms. Choose ical4j if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.