head to head · open source
Cal.com vs kubestellar
Cal.com has 48,529 GitHub stars, 15,154 forks, 1,432 open issues and last shipped 4 days ago. kubestellar has 711 stars, 316 forks, 215 open issues and last shipped 15 days ago. Cal.com leads on adoption by 6,725% (48,529 vs 711 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 44%. 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 | kubestellar | |
|---|---|---|
| GitHub stars | ★ 49K | ★ 711 |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Go |
| Last push | 2026-09-14 | 2026-09-03 |
| Forks | ⑂ 15K | ⑂ 316 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cal.com if
- You weight community size — 49K 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
Cal.diy is a fully open source, community maintained fork of Cal.com, stripped of all enterprise and commercial features. It provides a self hosted scheduling platform built on the T3 stack (Next.js, tRPC, Prisma, Tailwind CSS, Zod), licensed under MIT with no proprietary code or license keys required.
read the full Cal.com overview →
About kubestellar
KubeStellar is an Apache 2.0, CNCF Sandbox multi cluster configuration management engine, written in Go, that lets teams deploy and configure workloads across many Kubernetes clusters — edge, multi cloud, and hybrid cloud — using the same single cluster tooling they already run.
read the full kubestellar overview →
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Frequently asked questions
Is Cal.com or kubestellar more popular?
Cal.com has 48,529 GitHub stars and kubestellar has 711. 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 (48,529 stars) or its MIT licence terms. Choose kubestellar if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.