head to head · open source
Cal.com vs Tone.js
Cal.com has 48,529 GitHub stars, 15,154 forks, 1,432 open issues and last shipped 4 days ago. Tone.js has 14,725 stars, 1,063 forks, 65 open issues and last shipped 2 days ago. Cal.com leads on adoption by 230% (48,529 vs 14,725 stars). Cal.com is written in TypeScript under MIT; Tone.js is written in TypeScript under MIT. Cal.com has attracted 31% as many forks as stars, Tone.js 7%. Tone.js 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
| Cal.com | Tone.js | |
|---|---|---|
| GitHub stars | ★ 49K | ★ 15K |
| License | MIT | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-14 | 2026-09-16 |
| Forks | ⑂ 15K | ⑂ 1.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cal.com if
- You weight community size — 49K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Tone.js if
- You want the Tone.js feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Tone.js fits your workflow better
About Cal.com
Cal.diy is a fully open source, community maintained fork of Cal.com, stripped of all enterprise and commercial features. It provides a self hosted scheduling platform built on the T3 stack (Next.js, tRPC, Prisma, Tailwind CSS, Zod), licensed under MIT with no proprietary code or license keys required.
read the full Cal.com overview →
About Tone.js
Tone.js is a Web Audio framework for creating interactive music in the browser. It is written in TypeScript and released under the MIT license, and it lives in the JavaScript and Web Audio API ecosystem, where it is distributed through npm and unpkg. The project has been developed for roughly thirteen years and carries a substantial community footprint, with more than fourteen thousand stars and over a thousand forks on GitHub.
read the full Tone.js overview →
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Frequently asked questions
Is Cal.com or Tone.js more popular?
Cal.com has 48,529 GitHub stars and Tone.js has 14,725. Cal.com has the larger community by that measure.
Are Cal.com and Tone.js free?
Both are open source. Cal.com is licensed under MIT and Tone.js under MIT. Neither carries a licence fee.
What is the difference between Cal.com and Tone.js?
Cal.com is written in TypeScript and Tone.js 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, Cal.com or Tone.js?
Choose Cal.com if you want the larger community (48,529 stars) or its MIT licence terms. Choose Tone.js if its feature set, stack or MIT licence fits better. Both are self-hostable.