# 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.

Repository: https://github.com/sitespeedio/sitespeed.io
Canonical: https://ross.abutalabs.com/products/sitespeedio
Homepage: https://www.sitespeed.io/
Language: JavaScript
License: MIT
License Family: permissive
Topics: web, metrics, monitoring, webperf, perfmatters, performance-metrics, performance-analysis, performance-dashboard, sitespeed
Last push: 2026-08-26T21:18:08+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 84, longevity 100
- inputs: {"age_days": 5173, "days_push": 7, "days_rel": 27, "gap_med": 2, "n_releases_24m": 112}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5016, forks 626 (observed 2026-08-28T04:09:04.715268+00:00)

## What it is
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
- artifact type: cli-tool
- maturity: active
- function: monitoring, benchmarking, analytics, developer-tools
- domain: web-development, performance, monitoring
- platform: windows, cli, self-hosted
- tags: web-performance, core-web-vitals, synthetic-testing, har, grafana, lighthouse-alternative, browser-testing, devops, nodejs, docker, linux, macos

## Member repositories
- sitespeedio/sitespeed.io (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:04.715268+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:17:31.767770+00:00, confidence not recorded.
  - readme: https://github.com/sitespeedio/sitespeed.io (fetched 2026-08-28T04:09:04.715268+00:00, sha df0b1583af24)
  - homepage: https://www.sitespeed.io/ (fetched 2026-08-29T08:58:41.591080+00:00, sha cff432ea2247)
  - site_page: https://www.sitespeed.io/documentation (fetched 2026-08-29T08:58:41.600250+00:00, sha 5b650b0c7ed4)
  - site_page: https://www.sitespeed.io/documentation/sitespeed.io (fetched 2026-08-29T08:58:41.601947+00:00, sha 64e54800b921)
  - site_page: https://www.sitespeed.io/documentation/browsertime (fetched 2026-08-29T08:58:41.603688+00:00, sha 3f8a75201e3f)
  - site_page: https://www.sitespeed.io/documentation/onlinetest (fetched 2026-08-29T08:58:41.605273+00:00, sha 15c70c57ef98)
  - site_page: https://www.sitespeed.io/documentation/throttle (fetched 2026-08-29T08:58:41.607419+00:00, sha d8b3edb3a0c4)
  - site_page: https://www.sitespeed.io/documentation/coach (fetched 2026-08-29T08:58:41.608952+00:00, sha 2ab5ab7c38f2)
  - site_page: https://www.sitespeed.io/documentation/pagexray (fetched 2026-08-29T08:58:41.610377+00:00, sha 7add522ba249)
  - site_page: https://www.sitespeed.io/documentation/humble (fetched 2026-08-29T08:58:41.611957+00:00, sha b112110d84d3)
- Data as of 2026-08-30T08:39:29.467469+00:00.