head to head · open source
Cal.com vs koordinator
Cal.com has 49,651 GitHub stars, 15,521 forks, 1,432 open issues and last shipped yesterday. koordinator has 1,766 stars, 489 forks, 228 open issues and last shipped 11 days ago. Cal.com leads on adoption by 2,711% (49,651 vs 1,766 stars). Cal.com is written in TypeScript under MIT; koordinator is written in Go under Apache-2.0. Cal.com has attracted 31% as many forks as stars, koordinator 28%. 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.
← all 20902 open source comparisons
Side by side
| Cal.com | koordinator | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 1.8K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Go |
| Last push | 2026-11-02 | 2026-10-23 |
| Forks | ⑂ 16K | ⑂ 489 |
| 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 koordinator if
- You want the koordinator feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and koordinator 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 koordinator
Koordinator English 简体中文 Introduction Koordinator is a QoS based scheduling system for hybrid orchestration workloads on Kubernetes. Its goal is to improve the runtime efficiency and reliability of both latency sensitive workloads and batch jobs, simplify the complexity of resource related configuration tuning, and increase pod deployment density to improve resource utilization. Koordinator enhances the kubernetes user experiences in the workload management by providing the following: Improved Resource Utilization: Koordinator is designed to optimize the utilization of cluster resources, ensuring that all nodes…
read the full koordinator overview →
More in Business Software
Related comparisons
More Scheduling & Event Management projects
Compare either of these against the rest of the Scheduling & Event Management field.
Frequently asked questions
Is Cal.com or koordinator more popular?
Cal.com has 49,651 GitHub stars and koordinator has 1,766. Cal.com has the larger community by that measure.
Are Cal.com and koordinator free?
Both are open source. Cal.com is licensed under MIT and koordinator under Apache-2.0. Neither carries a licence fee.
What is the difference between Cal.com and koordinator?
Cal.com is written in TypeScript and koordinator in Go. 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 koordinator?
Choose Cal.com if you want the larger community (49,651 stars) or its MIT licence terms. Choose koordinator if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.