head to head · open source
Sentry vs kmon
Sentry has 44,806 GitHub stars, 4,857 forks, 2,265 open issues and last shipped today. kmon has 2,948 stars, 93 forks, 23 open issues and last shipped 3 days ago. Sentry leads on adoption by 1,420% (44,806 vs 2,948 stars). Sentry is written in Python under a custom or non-standard licence; kmon is written in Rust under GPL-3.0. Sentry has attracted 11% as many forks as stars, kmon 3%. Sentry was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (hacktoberfest, 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 | kmon | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 2.9K |
| License | Custom / other | GPL-3.0 |
| Written in | Python | Rust |
| Last push | 2026-09-20 | 2026-09-17 |
| Forks | ⑂ 4.9K | ⑂ 93 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Sentry if
- You weight community size — 45K 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 kmon if
- You want the kmon feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Rust
- You evaluated both and kmon fits your workflow better
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 →
About kmon
kmon is a Linux kernel manager and activity monitor written in Rust that gives system administrators and developers a terminal user interface for inspecting kernel information and managing loadable kernel modules.
More in Infrastructure & Operations
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Frequently asked questions
Is Sentry or kmon more popular?
Sentry has 44,806 GitHub stars and kmon has 2,948. Sentry has the larger community by that measure.
Are Sentry and kmon free?
Both are open source. Sentry has no licence declared in this registry, and kmon is licensed under GPL-3.0. Both are free to self-host.
What is the difference between Sentry and kmon?
Sentry is written in Python and kmon in Rust. 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 kmon?
Choose Sentry if you want the larger community (44,806 stars) or its Custom / other licence terms. Choose kmon if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.