head to head · open source
Tone.js vs ical4j
Tone.js has 14,874 GitHub stars, 1,086 forks, 65 open issues and last shipped 2 days ago. ical4j has 841 stars, 225 forks, 162 open issues and last shipped 3 days ago. Tone.js leads on adoption by 1,669% (14,874 vs 841 stars). Tone.js is written in TypeScript under MIT; ical4j is written in Java under BSD-3-Clause. Tone.js has attracted 7% as many forks as stars, ical4j 27%. Tone.js 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
| Tone.js | ical4j | |
|---|---|---|
| GitHub stars | ★ 15K | ★ 841 |
| License | MIT | BSD-3-Clause |
| Written in | TypeScript | Java |
| Last push | 2026-11-01 | 2026-10-31 |
| Forks | ⑂ 1.1K | ⑂ 225 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Tone.js if
- You weight community size — 15K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- 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 Tone.js
Tone.js Tone.js is a Web Audio framework for creating interactive music in the browser. The architecture of Tone.js aims to be familiar to both musicians and audio programmers creating web based audio applications. On the high level, Tone offers common DAW (digital audio workstation) features like a global transport for synchronizing and scheduling events as well as prebuilt synths and effects. Additionally, Tone provides high performance building blocks to create your own synthesizers, effects, and complex control signals. API Examples Installation There are two ways to incorporate Tone.js into a project…
read the full Tone.js 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 Tone.js or ical4j more popular?
Tone.js has 14,874 GitHub stars and ical4j has 841. Tone.js has the larger community by that measure.
Are Tone.js and ical4j free?
Both are open source. Tone.js is licensed under MIT and ical4j under BSD-3-Clause. Neither carries a licence fee.
What is the difference between Tone.js and ical4j?
Tone.js is written in TypeScript 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, Tone.js or ical4j?
Choose Tone.js if you want the larger community (14,874 stars) or its MIT licence terms. Choose ical4j if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.