head to head · open source
Sentry vs Checkmk
Sentry has 45,704 GitHub stars, 4,959 forks, 2,265 open issues and last shipped yesterday. Checkmk has 2,632 stars, 580 forks, 55 open issues and last shipped 2 days ago. Sentry leads on adoption by 1,636% (45,704 vs 2,632 stars). Sentry is written in Python under a custom or non-standard licence; Checkmk is written in Python under GPL-2.0. Sentry has attracted 11% as many forks as stars, Checkmk 22%. Sentry 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
| Sentry | Checkmk | |
|---|---|---|
| GitHub stars | ★ 46K | ★ 2.6K |
| License | Custom / other | GPL-2.0 |
| Written in | Python | Python |
| Last push | 2026-11-04 | 2026-11-03 |
| Forks | ⑂ 5.0K | ⑂ 580 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Sentry if
- You weight community size — 46K stars and counting
- You want the Custom / other license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Checkmk if
- You want the Checkmk feature set and don't need the biggest community
- You prefer the GPL-2.0 license terms
- Your stack matches Python
- You evaluated both and Checkmk fits your workflow better
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 →
About Checkmk
Checkmk Your complete IT monitoring solution Checkmk is a comprehensive IT monitoring system designed for scalability, flexibility, and low resource consumption. It supports infrastructure and application monitoring across physical, virtual, containerized, and cloud environments. Checkmk is available in several editions, each suited to different operational needs. Please visit our website for more details, documentation, new releases, discussion forums, and more. Checkmk Community Checkmk Community is completely free and open source (licensed under the GNU GPL v2). It includes the core Checkmk monitoring engine…
read the full Checkmk overview →
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Frequently asked questions
Is Sentry or Checkmk more popular?
Sentry has 45,704 GitHub stars and Checkmk has 2,632. Sentry has the larger community by that measure.
Are Sentry and Checkmk free?
Both are open source. Sentry has no licence declared in this registry, and Checkmk is licensed under GPL-2.0. Both are free to self-host.
What is the difference between Sentry and Checkmk?
Sentry is written in Python and Checkmk 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, Sentry or Checkmk?
Choose Sentry if you want the larger community (45,704 stars) or its Custom / other licence terms. Choose Checkmk if its feature set, stack or GPL-2.0 licence fits better. Both are self-hostable.