head to head · open source
Sentry vs sitespeed.io
Sentry has 44,806 GitHub stars, 4,857 forks, 2,265 open issues and last shipped today. sitespeed.io has 5,029 stars, 624 forks, 159 open issues and last shipped 4 days ago. Sentry leads on adoption by 791% (44,806 vs 5,029 stars). Sentry is written in Python under a custom or non-standard licence; sitespeed.io is written in JavaScript under MIT. Sentry has attracted 11% as many forks as stars, sitespeed.io 12%. 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 | sitespeed.io | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 5.0K |
| License | Custom / other | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-09-20 | 2026-09-16 |
| Forks | ⑂ 4.9K | ⑂ 624 |
| 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 sitespeed.io if
- You want the sitespeed.io feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and sitespeed.io 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 sitespeed.io
sitespeed.io is a free, MIT licensed open source web performance tool that drives real browsers to test, monitor, and optimize website speed, and it is aimed at developers, performance engineers, and operations teams that want their own measurement data without signing up for a hosted service.
read the full sitespeed.io overview →
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Frequently asked questions
Is Sentry or sitespeed.io more popular?
Sentry has 44,806 GitHub stars and sitespeed.io has 5,029. Sentry has the larger community by that measure.
Are Sentry and sitespeed.io free?
Both are open source. Sentry has no licence declared in this registry, and sitespeed.io is licensed under MIT. Both are free to self-host.
What is the difference between Sentry and sitespeed.io?
Sentry is written in Python and sitespeed.io in JavaScript. 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 sitespeed.io?
Choose Sentry if you want the larger community (44,806 stars) or its Custom / other licence terms. Choose sitespeed.io if its feature set, stack or MIT licence fits better. Both are self-hostable.