publiccodeYmlVersion: "0.5.0"

name: sitespeed.io
url: "https://github.com/sitespeedio/sitespeed.io"
landingURL: "https://www.sitespeed.io"
softwareVersion: "41.4.1"
releaseDate: "2026-07-03"

logo: docs/img/sitespeed.io-logo-large.png

platforms:
  - linux
  - mac
  - windows
  - web

categories:
  - it-development
  - data-analytics

developmentStatus: stable
softwareType: standalone/backend

description:
  en:
    localisedName: sitespeed.io
    genericName: Web performance tool
    shortDescription: >-
      Open-source command-line tool that measures web page performance
      using real browsers and produces an HTML report, JSON metrics,
      and time-series data for Grafana dashboards.
    longDescription: >
      sitespeed.io is an open-source web performance tool used to test,
      monitor and optimise the speed of websites. It drives a real
      browser — Firefox, Chrome, Edge or Safari, including Safari on a
      real iPhone over USB — and collects Core Web Vitals (LCP, INP,
      CLS, TTFB, FCP), a video of the page load, visual metrics such as
      First Visual Change and Speed Index, the HAR waterfall, and the
      Coach's catalogue of best-practice advice.


      It can be used in three common ways. Run it once from a terminal
      to audit a slow page and open the HTML report to see what is
      slow. Run it in a CI pipeline on every pull request and fail the
      build when a performance budget is exceeded. Or run it on a
      schedule in production and ship the metrics to Graphite or
      InfluxDB to track performance over time in a Grafana dashboard.


      For privacy and EU regulatory reviews the third-party plugin
      inventories every external domain, entity and cookie each page
      loads, categorised by purpose (analytics, advertising,
      surveillance, video, social) using the public third-party-web
      dataset. The output is *input* to a review — it surfaces what
      data flows out of the page — and is intentionally not a
      determination of compliance with the GDPR, the ePrivacy
      Directive or any other law. That judgement still belongs to the
      team running the audit.


      The project is free software, owned and operated by the
      contributors. It has been developed and maintained from Sweden,
      inside the European Union, since 2012, with no corporate owner
      and no acquisition exit. There is nothing to sign up for, and
      users keep full ownership of their measurement data. The tool
      ships as an npm package and a reproducible multi-architecture
      Docker image with Firefox, Chrome and Edge preinstalled. Teams
      who would rather not give every contributor command-line access
      can instead self-host sitespeed.io behind the
      `sitespeedio/onlinetest` web UI and REST API, which wraps the
      same engine in a browser-based front end and is also free and
      open-source.
    documentation: "https://www.sitespeed.io/documentation/sitespeed.io/"
    apiDocumentation: "https://www.sitespeed.io/documentation/sitespeed.io/configuration/"
    features:
      - Core Web Vitals (LCP, INP, CLS, TTFB, FCP)
      - Visual metrics with scrubbable filmstrip
      - HAR waterfall rendering
      - Third-party domain, entity and cookie inventory for privacy reviews
      - Coach performance and best-practice advice
      - Performance budgets for CI regression testing
      - Time-series export to Graphite and InfluxDB
      - Slack and Matrix notifications
      - Result upload to S3, GCS, SFTP and rsync
      - Multi-architecture Docker image (amd64, arm64)
      - Scriptable user journeys via browsertime

legal:
  license: MIT
  mainCopyrightOwner: sitespeed.io contributors
  repoOwner: sitespeed.io

maintenance:
  type: community
  contacts:
    - name: Peter Hedenskog
      email: peter@soulgalore.com
      affiliation: sitespeed.io

localisation:
  localisationReady: false
  availableLanguages:
    - en