head to head · open source
Uptime Kuma vs frostmourne
Uptime Kuma has 91,498 GitHub stars, 8,431 forks, 805 open issues and last shipped yesterday. frostmourne has 1,494 stars, 317 forks, 31 open issues and last shipped 5 months ago. Uptime Kuma leads on adoption by 6,024% (91,498 vs 1,494 stars). Uptime Kuma is written in JavaScript under MIT; frostmourne is written in Java under MIT. Uptime Kuma has attracted 9% as many forks as stars, frostmourne 21%. 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 (monitor), 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 | frostmourne | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 1.5K |
| License | MIT | MIT |
| Written in | JavaScript | Java |
| Last push | 2026-09-18 | 2026-04-17 |
| Forks | ⑂ 8.4K | ⑂ 317 |
| 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 frostmourne if
- You want the frostmourne feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Java
- You evaluated both and frostmourne 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 frostmourne
Frostmourne（霜之哀伤监控平台）is an MIT licensed, Java based distributed monitoring and alerting system that turns queries against Elasticsearch, Prometheus, SkyWalking, InfluxDB, MySQL/TiDB, ClickHouse, SqlServer and IoTDB data into alarms, and it is built for operations and development teams that already run a log or metrics stack but lack a matching alerting layer.
read the full frostmourne overview →
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Frequently asked questions
Is Uptime Kuma or frostmourne more popular?
Uptime Kuma has 91,498 GitHub stars and frostmourne has 1,494. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and frostmourne free?
Both are open source. Uptime Kuma is licensed under MIT and frostmourne under MIT. Neither carries a licence fee.
What is the difference between Uptime Kuma and frostmourne?
Uptime Kuma is written in JavaScript and frostmourne 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 frostmourne?
Choose Uptime Kuma if you want the larger community (91,498 stars) or its MIT licence terms. Choose frostmourne if its feature set, stack or MIT licence fits better. Both are self-hostable.