head to head · open source
Uptime Kuma vs Checkmk
Uptime Kuma has 93,190 GitHub stars, 8,655 forks, 805 open issues and last shipped yesterday. Checkmk has 2,633 stars, 580 forks, 55 open issues and last shipped yesterday. Uptime Kuma leads on adoption by 3,439% (93,190 vs 2,633 stars). Uptime Kuma is written in JavaScript under MIT; Checkmk is written in Python under GPL-2.0. Uptime Kuma has attracted 9% as many forks as stars, Checkmk 22%. Uptime Kuma was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (monitoring), 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
| Uptime Kuma | Checkmk | |
|---|---|---|
| GitHub stars | ★ 93K | ★ 2.6K |
| License | MIT | GPL-2.0 |
| Written in | JavaScript | Python |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 8.7K | ⑂ 580 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Uptime Kuma if
- You weight community size — 93K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick Checkmk if
- You want the Checkmk feature set and don't need the biggest community
- You prefer the GPL-2.0 license terms
- Your stack matches Python
- You evaluated both and Checkmk fits your workflow better
About Uptime Kuma
Uptime Kuma Uptime Kuma is an easy to use self hosted monitoring tool. 🥔 Live Demo Try it! Demo Server (Location: Frankfurt Germany): It is a temporary live demo, all data will be deleted after 10 minutes. Sponsored by Uptime Kuma Sponsors. ⭐ Features Monitoring uptime for HTTP(s) / TCP / HTTP(s) Keyword / HTTP(s) Json Query / Websocket / Ping / DNS Record / Push / Steam Game Server / Docker Containers Fancy, Reactive, Fast UI/UX Notifications via Telegram, Discord, Gotify, Slack, Pushover, Email (SMTP), and 90+ notification services, click here for the full list 20 second intervals Multi Languages Multiple…
read the full Uptime Kuma overview →
About Checkmk
Checkmk Your complete IT monitoring solution Checkmk is a comprehensive IT monitoring system designed for scalability, flexibility, and low resource consumption. It supports infrastructure and application monitoring across physical, virtual, containerized, and cloud environments. Checkmk is available in several editions, each suited to different operational needs. Please visit our website for more details, documentation, new releases, discussion forums, and more. Checkmk Community Checkmk Community is completely free and open source (licensed under the GNU GPL v2). It includes the core Checkmk monitoring engine…
read the full Checkmk overview →
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Frequently asked questions
Is Uptime Kuma or Checkmk more popular?
Uptime Kuma has 93,190 GitHub stars and Checkmk has 2,633. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and Checkmk free?
Both are open source. Uptime Kuma is licensed under MIT and Checkmk under GPL-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and Checkmk?
Uptime Kuma is written in JavaScript and Checkmk in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Uptime Kuma or Checkmk?
Choose Uptime Kuma if you want the larger community (93,190 stars) or its MIT licence terms. Choose Checkmk if its feature set, stack or GPL-2.0 licence fits better. Both are self-hostable.