head to head · open source
Uptime Kuma vs client_js
Uptime Kuma has 91,498 GitHub stars, 8,431 forks, 805 open issues and last shipped today. client_js has 3,489 stars, 428 forks, 50 open issues and last shipped yesterday. Uptime Kuma leads on adoption by 2,522% (91,498 vs 3,489 stars). Uptime Kuma is written in JavaScript under MIT; client_js is written in JavaScript under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, client_js 12%. 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 | client_js | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 3.5K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | JavaScript |
| Last push | 2026-09-18 | 2026-09-17 |
| Forks | ⑂ 8.4K | ⑂ 428 |
| 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_js if
- You want the client_js feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches JavaScript
- You evaluated both and client_js 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_js
Prometheus client for Node.js A prometheus client for Node.js that supports histogram, summaries, gauges and counters. Installation This package was previously published as prom client . See the CHANGELOG for the breaking changes involved in upgrading. API See example folder for a sample usage. The library does not bundle any web framework. To expose the metrics, respond to Prometheus's scrape requests with the result of await registry.metrics() . Default metrics There are some default metrics recommended by Prometheus itself. To collect these, call collectDefaultMetrics . In addition, some Node.js specific metri…
read the full client_js overview →
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Frequently asked questions
Is Uptime Kuma or client_js more popular?
Uptime Kuma has 91,498 GitHub stars and client_js has 3,489. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and client_js free?
Both are open source. Uptime Kuma is licensed under MIT and client_js under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and client_js?
Uptime Kuma is written in JavaScript and client_js in JavaScript. 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_js?
Choose Uptime Kuma if you want the larger community (91,498 stars) or its MIT licence terms. Choose client_js if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.