head to head · open source
Cal.com vs someday
Cal.com has 48,529 GitHub stars, 15,154 forks, 1,432 open issues and last shipped 4 days ago. someday has 1,062 stars, 59 forks, 5 open issues and last shipped 2 months ago. Cal.com leads on adoption by 4,470% (48,529 vs 1,062 stars). Cal.com is written in TypeScript under MIT; someday is written in TypeScript under MIT. Cal.com has attracted 31% as many forks as stars, someday 6%. Cal.com was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (typescript), 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
| Cal.com | someday | |
|---|---|---|
| GitHub stars | ★ 49K | ★ 1.1K |
| License | MIT | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-14 | 2026-07-20 |
| Forks | ⑂ 15K | ⑂ 59 |
| 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 someday if
- You want the someday feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and someday 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 someday
Someday is a free to host, open source calendar availability picker built on Google Apps Script for Gmail users, and it is aimed at individuals, small teams, and developers who want a Calendly style booking page without paying for or operating a separate scheduling service.
read the full someday overview →
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Frequently asked questions
Is Cal.com or someday more popular?
Cal.com has 48,529 GitHub stars and someday has 1,062. Cal.com has the larger community by that measure.
Are Cal.com and someday free?
Both are open source. Cal.com is licensed under MIT and someday under MIT. Neither carries a licence fee.
What is the difference between Cal.com and someday?
Cal.com is written in TypeScript and someday 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 someday?
Choose Cal.com if you want the larger community (48,529 stars) or its MIT licence terms. Choose someday if its feature set, stack or MIT licence fits better. Both are self-hostable.