head to head · open source
Cal.com vs Rallly
Cal.com has 49,651 GitHub stars, 15,521 forks, 1,432 open issues and last shipped yesterday. Rallly has 5,337 stars, 586 forks, 2 open issues and last shipped yesterday. Cal.com leads on adoption by 830% (49,651 vs 5,337 stars). Cal.com is written in TypeScript under MIT; Rallly is written in TypeScript under AGPL-3.0. Cal.com has attracted 31% as many forks as stars, Rallly 11%. Rallly was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 10 topic tags (next-auth, nextjs, postgresql, prisma), 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 | Rallly | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 5.3K |
| License | MIT | AGPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 16K | ⑂ 586 |
| 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 Rallly if
- You want the Rallly feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and Rallly 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 Rallly
Rallly Schedule group meetings, without the back and forth Website · Documentation · Discord Rallly is an open source scheduling tool that helps you find the best date and time to meet. Create a poll with a few options, share the link, and let your participants vote on when they're available. No more back and forth emails. ✨ Features 📅 Date & time polls — Propose multiple options and find what works for everyone 🗳️ No account needed to vote — Participants just open the link and respond 📊 Availability grid — See everyone's responses at a glance 💬 Comments — Discuss the details right on the poll 🔔…
read the full Rallly overview →
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Frequently asked questions
Is Cal.com or Rallly more popular?
Cal.com has 49,651 GitHub stars and Rallly has 5,337. Cal.com has the larger community by that measure.
Are Cal.com and Rallly free?
Both are open source. Cal.com is licensed under MIT and Rallly under AGPL-3.0. Neither carries a licence fee.
What is the difference between Cal.com and Rallly?
Cal.com is written in TypeScript and Rallly 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 Rallly?
Choose Cal.com if you want the larger community (49,651 stars) or its MIT licence terms. Choose Rallly if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.