head to head · open source
Uptime Kuma vs sloth
Uptime Kuma has 93,190 GitHub stars, 8,655 forks, 805 open issues and last shipped yesterday. sloth has 2,566 stars, 232 forks, 25 open issues and last shipped 6 days ago. Uptime Kuma leads on adoption by 3,532% (93,190 vs 2,566 stars). Uptime Kuma is written in JavaScript under MIT; sloth is written in Go under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, sloth 9%. 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 | sloth | |
|---|---|---|
| GitHub stars | ★ 93K | ★ 2.6K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-11-02 | 2026-10-28 |
| Forks | ⑂ 8.7K | ⑂ 232 |
| 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 sloth if
- You want the sloth 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 sloth 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 sloth
Sloth Project status Sloth is actively maintained and in continuous development. We’re currently working on internal improvements to make Sloth even more extensible and adaptable to real world use cases. While Sloth already supports custom SLI plugins, upcoming changes will bring more flexibility to how SLOs are generated, making it easier to adapt Sloth to your custom needs. Stay tuned for updates! Introduction Meet the easiest way to generate [SLOs][google slo] for Prometheus. Sloth generates understandable, uniform and reliable Prometheus SLOs for any kind of service. Using a simple SLO spec that results in…
read the full sloth overview →
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Frequently asked questions
Is Uptime Kuma or sloth more popular?
Uptime Kuma has 93,190 GitHub stars and sloth has 2,566. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and sloth free?
Both are open source. Uptime Kuma is licensed under MIT and sloth under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and sloth?
Uptime Kuma is written in JavaScript and sloth 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, Uptime Kuma or sloth?
Choose Uptime Kuma if you want the larger community (93,190 stars) or its MIT licence terms. Choose sloth if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.