head to head · open source
Sentry vs sloth
Sentry has 45,704 GitHub stars, 4,959 forks, 2,265 open issues and last shipped yesterday. sloth has 2,566 stars, 232 forks, 25 open issues and last shipped 8 days ago. Sentry leads on adoption by 1,681% (45,704 vs 2,566 stars). Sentry is written in Python under a custom or non-standard licence; sloth is written in Go under Apache-2.0. Sentry has attracted 11% as many forks as stars, sloth 9%. 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 | sloth | |
|---|---|---|
| GitHub stars | ★ 46K | ★ 2.6K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | Go |
| Last push | 2026-11-04 | 2026-10-28 |
| Forks | ⑂ 5.0K | ⑂ 232 |
| 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 sloth if
- You want the sloth feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and sloth 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 sloth
Sloth Project status Sloth is actively maintained and in continuous development. We’re currently working on internal improvements to make Sloth even more extensible and adaptable to real world use cases. While Sloth already supports custom SLI plugins, upcoming changes will bring more flexibility to how SLOs are generated, making it easier to adapt Sloth to your custom needs. Stay tuned for updates! Introduction Meet the easiest way to generate [SLOs][google slo] for Prometheus. Sloth generates understandable, uniform and reliable Prometheus SLOs for any kind of service. Using a simple SLO spec that results in…
read the full sloth overview →
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Frequently asked questions
Is Sentry or sloth more popular?
Sentry has 45,704 GitHub stars and sloth has 2,566. Sentry has the larger community by that measure.
Are Sentry and sloth free?
Both are open source. Sentry has no licence declared in this registry, and sloth is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Sentry and sloth?
Sentry is written in Python and sloth in Go. 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 sloth?
Choose Sentry if you want the larger community (45,704 stars) or its Custom / other licence terms. Choose sloth if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.