head to head · open source
Uptime Kuma vs Sentry
Uptime Kuma has 93,190 GitHub stars, 8,655 forks, 805 open issues and last shipped yesterday. Sentry has 45,697 stars, 4,959 forks, 2,265 open issues and last shipped yesterday. Uptime Kuma leads on adoption by 104% (93,190 vs 45,697 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%. Sentry 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 | ★ 93K | ★ 46K |
| License | MIT | Custom / other |
| Written in | JavaScript | Python |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 8.7K | ⑂ 5.0K |
| 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 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 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 Sentry
Users and logs provide clues. Sentry provides answers. What's Sentry? Sentry is the debugging platform that helps every developer detect, trace, and fix issues. Code breaks, fix it faster. Official Sentry SDKs JavaScript Electron React Native Python Ruby PHP Laravel Go Rust Java/Kotlin Objective C/Swift C\ /F\ C/C++ Dart/Flutter Perl Clojure Elixir Unity Unreal Engine Godot Engine PowerShell Resources Documentation Discussions (Bugs, feature requests, general questions) Discord Contributing Bug Tracker Code Transifex (Translate Sentry\!)
read the full Sentry overview →
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Frequently asked questions
Is Uptime Kuma or Sentry more popular?
Uptime Kuma has 93,190 GitHub stars and Sentry has 45,697. 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 (93,190 stars) or its MIT licence terms. Choose Sentry if its feature set, stack or Custom / other licence fits better. Both are self-hostable.