head to head · open source
Cal.com vs kubestellar
Cal.com has 49,651 GitHub stars, 15,521 forks, 1,432 open issues and last shipped yesterday. kubestellar has 726 stars, 330 forks, 215 open issues and last shipped yesterday. Cal.com leads on adoption by 6,739% (49,651 vs 726 stars). Cal.com is written in TypeScript under MIT; kubestellar is written in Go under Apache-2.0. Cal.com has attracted 31% as many forks as stars, kubestellar 45%. kubestellar 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 | kubestellar | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 726 |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Go |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 16K | ⑂ 330 |
| 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 kubestellar if
- You want the kubestellar 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 kubestellar 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 kubestellar
Multi cluster Configuration Management for Edge, Multi Cloud, and Hybrid Cloud KubeStellar is a Cloud Native Computing Foundation (CNCF) Sandbox project that simplifies the deployment and configuration of applications across multiple Kubernetes clusters. It provides a seamless experience akin to using a single cluster, and it integrates with the tools you're already familiar with, eliminating the need to modify existing resources. KubeStellar is particularly beneficial if you're currently deploying in a single cluster and are looking to expand to multiple clusters, or if you're already using multiple clusters…
read the full kubestellar overview →
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Frequently asked questions
Is Cal.com or kubestellar more popular?
Cal.com has 49,651 GitHub stars and kubestellar has 726. Cal.com has the larger community by that measure.
Are Cal.com and kubestellar free?
Both are open source. Cal.com is licensed under MIT and kubestellar under Apache-2.0. Neither carries a licence fee.
What is the difference between Cal.com and kubestellar?
Cal.com is written in TypeScript and kubestellar 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 kubestellar?
Choose Cal.com if you want the larger community (49,651 stars) or its MIT licence terms. Choose kubestellar if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.