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publiccodeYmlVersion: "0.5.0"
name: sitespeed.io
url: "https://github.com/sitespeedio/sitespeed.io"
landingURL: "https://www.sitespeed.io"
softwareVersion: "42.3.0"
releaseDate: "2026-07-22"
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