head to head · open source
Uptime Kuma vs Sentry
Uptime Kuma has 91,477 GitHub stars, 8,426 forks, 805 open issues and last shipped yesterday. Sentry has 44,792 stars, 4,854 forks, 2,265 open issues and last shipped yesterday. Uptime Kuma leads on adoption by 104% (91,477 vs 44,792 stars). Uptime Kuma is written in JavaScript under MIT; Sentry is written in Python under a custom or non-standard licence. Uptime Kuma has attracted 9% as many forks as stars, Sentry 11%. Uptime Kuma was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (monitor, 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 | Sentry | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 45K |
| License | MIT | Custom / other |
| Written in | JavaScript | Python |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 8.4K | ⑂ 4.9K |
| 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 Sentry if
- You want the Sentry feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Python
- You evaluated both and Sentry 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 Sentry
Sentry is an open source debugging platform for detecting, tracing, and fixing software issues in real time. It lives in the developer infrastructure ecosystem and provides error tracking and performance monitoring across languages, frameworks, and runtime environments.
read the full Sentry overview →
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Frequently asked questions
Is Uptime Kuma or Sentry more popular?
Uptime Kuma has 91,477 GitHub stars and Sentry has 44,792. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and Sentry free?
Both are open source. Uptime Kuma is licensed under MIT, and Sentry has no licence declared in this registry. Both are free to self-host.
What is the difference between Uptime Kuma and Sentry?
Uptime Kuma is written in JavaScript and Sentry in Python. 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 Sentry?
Choose Uptime Kuma if you want the larger community (91,477 stars) or its MIT licence terms. Choose Sentry if its feature set, stack or Custom / other licence fits better. Both are self-hostable.