head to head · open source
Sentry vs sitespeed.io
Sentry has 45,704 GitHub stars, 4,959 forks, 2,265 open issues and last shipped yesterday. sitespeed.io has 5,046 stars, 631 forks, 159 open issues and last shipped 3 days ago. Sentry leads on adoption by 806% (45,704 vs 5,046 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 13%. 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 | ★ 46K | ★ 5.0K |
| License | Custom / other | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-11-04 | 2026-11-02 |
| Forks | ⑂ 5.0K | ⑂ 631 |
| 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 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
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 sitespeed.io
sitespeed.io [![Downloads][downloads image]][downloads url] [![Docker][docker image]][docker url] [![Stars][stars image]][stars url] [![npm][npm image]][npm url] [![Changelog 212][changelog image]][changelog url] Website Documentation Changelog Bluesky Mastodon Table of Contents What is sitespeed.io? Documentation Installation Docker NodeJS Usage Basic usage Advanced configuration Mobile testing Examples Contributing Reporting issues Community License What is sitespeed.io? sitespeed.io is an Open Source web performance tool. Run it once to debug a slow page and you get an HTML report with Core Web Vitals, a…
read the full sitespeed.io overview →
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Frequently asked questions
Is Sentry or sitespeed.io more popular?
Sentry has 45,704 GitHub stars and sitespeed.io has 5,046. 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 (45,704 stars) or its Custom / other licence terms. Choose sitespeed.io if its feature set, stack or MIT licence fits better. Both are self-hostable.