head to head · open source
Uptime Kuma vs client_js
Uptime Kuma has 93,190 GitHub stars, 8,655 forks, 805 open issues and last shipped yesterday. client_js has 3,498 stars, 431 forks, 50 open issues and last shipped 2 days ago. Uptime Kuma leads on adoption by 2,564% (93,190 vs 3,498 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 | ★ 93K | ★ 3.5K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | JavaScript |
| Last push | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 8.7K | ⑂ 431 |
| 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 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 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…
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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…
read the full client_js overview →
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Frequently asked questions
Is Uptime Kuma or client_js more popular?
Uptime Kuma has 93,190 GitHub stars and client_js has 3,498. 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 (93,190 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.