head to head · open source
Cal.com vs someday
Cal.com has 49,651 GitHub stars, 15,521 forks, 1,432 open issues and last shipped yesterday. someday has 1,063 stars, 57 forks, 5 open issues and last shipped 4 months ago. Cal.com leads on adoption by 4,571% (49,651 vs 1,063 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 5%. 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 | ★ 50K | ★ 1.1K |
| License | MIT | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-07-20 |
| Forks | ⑂ 16K | ⑂ 57 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cal.com if
- You weight community size — 50K 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
[!WARNING] Use at your own risk. Cal.diy is the open source community edition of Cal.com and it is intended for users who want to self host their own Cal.diy instance. It is strictly recommended for personal, non production use. Please review all installation and configuration steps carefully. Self hosting requires advanced knowledge of server administration, database management, and securing sensitive data. Proceed only if you are comfortable with these responsibilities. [!TIP] For any commercial and enterprise ready scheduling infrastructure, use Cal.com, not Cal.diy; hosted by us or get invited to on prem…
read the full Cal.com overview →
About someday
Someday Free to host calendar availability picker open source cal.com / calendly alternative built on Google Apps Script for Gmail users. Demo (mocked endpoints) What is Someday? Someday is a simple, open source scheduling tool designed specifically for Gmail users. Uses Google Apps Scripts to host and clasp to manage. Built with modern technologies like React, TypeScript, Shadcn/UI, and Vite. A simple alternative to traditional scheduling apps like Calendly. Key Features Free to Host : Using Google Apps Script, hosting is free via your google account. Open Source : Someday is completely free to use and open for…
read the full someday overview →
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Frequently asked questions
Is Cal.com or someday more popular?
Cal.com has 49,651 GitHub stars and someday has 1,063. 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 (49,651 stars) or its MIT licence terms. Choose someday if its feature set, stack or MIT licence fits better. Both are self-hostable.