head to head · open source
Uptime Kuma vs client_java
Uptime Kuma has 91,498 GitHub stars, 8,431 forks, 805 open issues and last shipped today. client_java has 2,289 stars, 833 forks, 23 open issues and last shipped today. Uptime Kuma leads on adoption by 3,897% (91,498 vs 2,289 stars). Uptime Kuma is written in JavaScript under MIT; client_java is written in Java under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, client_java 36%. client_java 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
| Uptime Kuma | client_java | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 2.3K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-09-18 | 2026-09-18 |
| Forks | ⑂ 8.4K | ⑂ 833 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Uptime Kuma if
- You weight community size — 91K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick client_java if
- You want the client_java 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 client_java fits your workflow better
About Uptime Kuma
Uptime Kuma is a free, MIT licensed, self hosted monitoring tool with a reactive web dashboard, built for operators and teams that want to watch their own HTTP, TCP, and DNS endpoints and keep the resulting data on their own infrastructure.
read the full Uptime Kuma overview →
About client_java
Prometheus Java Metrics Library [![Build][build badge]][build workflow] [build badge]: [build workflow]: Documentation Contributing and community See CONTRIBUTING.md and the community section of the Prometheus homepage. The Prometheus Java community is present on the CNCF Slack on prometheus java , and we have a fortnightly community call in the Prometheus public calendar. Previous Releases The source code for 0.16.0 and older is on the simpleclient branch. License Apache License 2.0, see LICENSE.
read the full client_java overview →
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Frequently asked questions
Is Uptime Kuma or client_java more popular?
Uptime Kuma has 91,498 GitHub stars and client_java has 2,289. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and client_java free?
Both are open source. Uptime Kuma is licensed under MIT and client_java under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and client_java?
Uptime Kuma is written in JavaScript and client_java 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, Uptime Kuma or client_java?
Choose Uptime Kuma if you want the larger community (91,498 stars) or its MIT licence terms. Choose client_java if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.