head to head · open source
Cal.com vs Saturn
Cal.com has 49,651 GitHub stars, 15,521 forks, 1,432 open issues and last shipped yesterday. Saturn has 2,306 stars, 684 forks, 279 open issues and last shipped 12 months ago. Cal.com leads on adoption by 2,053% (49,651 vs 2,306 stars). Cal.com is written in TypeScript under MIT; Saturn is written in Java under Apache-2.0. Cal.com has attracted 31% as many forks as stars, Saturn 30%. Cal.com 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 | Saturn | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 2.3K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Java |
| Last push | 2026-11-02 | 2025-11-12 |
| Forks | ⑂ 16K | ⑂ 684 |
| 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 Saturn if
- You want the Saturn feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and Saturn 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 Saturn
Saturn is a platform created by VIP.com(唯品会) to provide a distributed, fault tolerant and high available job scheduling service. Why Saturn? Time based and language unrestricted job Easy job implmentation and web based management Parallel subtask(shard) scheduling 1 second level scheduling supported Intelligent load based job allocation Fail detection & failover support Statistical data visualization All around monitoring and easy troubleshooting Multi active cluster deployment support Container friendly Stand the test of billion times scheduling per day and more Quick Start 快速安装 Make sure below stuff already…
read the full Saturn overview →
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Frequently asked questions
Is Cal.com or Saturn more popular?
Cal.com has 49,651 GitHub stars and Saturn has 2,306. Cal.com has the larger community by that measure.
Are Cal.com and Saturn free?
Both are open source. Cal.com is licensed under MIT and Saturn under Apache-2.0. Neither carries a licence fee.
What is the difference between Cal.com and Saturn?
Cal.com is written in TypeScript and Saturn 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, Cal.com or Saturn?
Choose Cal.com if you want the larger community (49,651 stars) or its MIT licence terms. Choose Saturn if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.