sitespeedio/sitespeed.io
sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments. observed · 2026-08-28
Health v2 · maintenance only
94/100
- Activity 99
- Release rhythm 84
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 2
- age_days: 5173
- days_rel: 27
- days_push: 7
- n_releases_24m: 112
Adoption not part of the score
5016 stars · 626 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
sitespeed.io is an open-source web performance testing and monitoring tool that drives real browsers (Chrome, Firefox, Edge, Safari) to collect Core Web Vitals, HAR waterfalls, videos, and coaching advice. It can run one-off diagnostics with HTML reports or continuously ship metrics to Graphite/InfluxDB for Grafana dashboards.
Use cases
- test why my web page is slow
- monitor website performance over time with Grafana
- track Core Web Vitals like LCP and CLS in CI
- run synthetic performance tests from Docker
- compare page speed before and after a deploy
- test mobile performance on a real phone
- generate a HAR waterfall and video of page load
When to choose
- you want self-hosted, open-source synthetic performance monitoring you fully own
- you need real-browser metrics with video, HAR, and visual metrics
- you want to integrate performance budgets into CI/CD pipelines
When to avoid
- you only need quick field/RUM data from real users rather than lab tests
- you want a zero-setup hosted service without running Docker or Node.js
- you need load/stress testing rather than single-user page performance
Facets
cli-tool · maturity active
monitoring benchmarking analytics developer-tools web-development performance monitoring windows cli self-hosted web-performance core-web-vitals synthetic-testing har grafana lighthouse-alternative browser-testing devops nodejs docker linux macos
10 sources
- readme: https://github.com/sitespeedio/sitespeed.io · fetched 2026-08-28 · df0b1583af24
- homepage: https://www.sitespeed.io/ · fetched 2026-08-29 · cff432ea2247
- site_page: https://www.sitespeed.io/documentation · fetched 2026-08-29 · 5b650b0c7ed4
- site_page: https://www.sitespeed.io/documentation/sitespeed.io · fetched 2026-08-29 · 64e54800b921
- site_page: https://www.sitespeed.io/documentation/browsertime · fetched 2026-08-29 · 3f8a75201e3f
- site_page: https://www.sitespeed.io/documentation/onlinetest · fetched 2026-08-29 · 15c70c57ef98
- site_page: https://www.sitespeed.io/documentation/throttle · fetched 2026-08-29 · d8b3edb3a0c4
- site_page: https://www.sitespeed.io/documentation/coach · fetched 2026-08-29 · 2ab5ab7c38f2
- site_page: https://www.sitespeed.io/documentation/pagexray · fetched 2026-08-29 · 7add522ba249
- site_page: https://www.sitespeed.io/documentation/humble · fetched 2026-08-29 · b112110d84d3
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| sitespeedio/sitespeed.io | main | 94 |
For agents
markdown · JSON · MCP: product_card(name="sitespeedio/sitespeed.io")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem