sitespeed.io

An open-source tool for measuring, analysing and monitoring the performance of web pages.

FreeOpen sourceCommand line
Official websitesitespeed.ioDocumentationsitespeed.io

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About sitespeed.io

sitespeed.io tests a web page or a scripted user journey and produces an HTML report with Core Web Vitals, a video of the page loading, a HAR waterfall and advice from its Coach on what to fix. It has been developed since 2012 and runs as a command-line tool or in Docker.

Run on a schedule, it can send metrics to Graphite or InfluxDB for Grafana dashboards that track performance over time. Browsertime, the Coach, PageXray and Throttle are available as separate tools. Version 40.0 added Safari on iOS testing.

Strengths

  • Detailed reports with video, HAR waterfall and Core Web Vitals
  • Scripting for multi-step user journeys
  • Sends metrics to Graphite or InfluxDB for long-term monitoring
  • You keep all your data

Limitations

  • Command-line setup takes more effort than an online checker
  • Long-term dashboards need your own Graphite or InfluxDB and Grafana

Details

Pricing
FreeFree and open source with no sign-up.
License
Open source, license not stated
Developer
The sitespeed.io contributors
Platforms
Command line
How it runs
Downloadable app
Account
Not required
Best suited for
Developers who want to test and monitor site performance on their own infrastructure
Last verified
Added
Provenance
Facts checked against the developer's own pages and store listings, 1 sources on file.

Alternatives to sitespeed.io

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Software that can replace sitespeed.io for an important use case, and what changes if you switch.

  • WebPageTest

    An online website performance tester with waterfall charts, filmstrips, multiple locations and throttled connections.

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    WebPageTest is an online service with waterfalls, filmstrips, multiple locations and throttled connections, so nothing to install, but tests run on its infrastructure and some features are paid.

  • Lighthouse CI

    A set of tools that runs Lighthouse audits on every commit and tracks results over time.

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    Lighthouse CI is an open-source tool that runs Lighthouse on every commit and can block regressions, focusing on CI pipelines rather than long-term Graphite or InfluxDB dashboards.

  • Yellow Lab Tools

    An open-source tool that audits a webpage for performance and front-end code quality issues.

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    Yellow Lab Tools is a GPL-2.0 tool with online, CLI and self-hosted options that also audits front-end code quality, though its development has slowed since early 2024.

  • Unlighthouse

    Open-source command-line tool that runs Google Lighthouse on every page of a site in parallel.

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    Unlighthouse is an MIT-licensed command-line tool that runs Lighthouse across every page of a site in parallel, with a local results interface, and requires Node 22.

  • SpeedCurve

    Hosted web performance monitoring service combining synthetic tests with real user monitoring.

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    SpeedCurve is a paid hosted service combining synthetic tests with real user monitoring and conversion correlation, so you no longer run infrastructure or keep the data yourself.

  • DebugBear

    A web performance testing and monitoring service with a free Core Web Vitals speed test.

    FreemiumProprietaryWeb

    DebugBear is a hosted freemium service combining lab tests with real-user Core Web Vitals, so your data lives with the vendor and continuous monitoring requires a paid plan.

  • GTmetrix

    An online page speed tester with waterfall charts, Core Web Vitals, scheduled monitoring and alerts.

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    GTmetrix is a hosted freemium tester with 25 test regions, scheduled monitoring and alerts, replacing self-run infrastructure with an account and paid options.

  • PageSpeed Insights

    Google's free web tool that reports Core Web Vitals and Lighthouse results for any URL.

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    PageSpeed Insights is Google's free web tool showing field and lab data for one URL, with no setup but no scripted journeys or ongoing monitoring.

sitespeed.io as an alternative

Listings that name sitespeed.io as an alternative.

  • KeyCDN Website Speed Test

    A free full-page speed test with a waterfall breakdown, run from one of 10 global locations.

    FreeProprietaryWeb

    sitespeed.io is an open-source CLI you run on your own infrastructure, with video, HAR waterfalls and long-term metrics, but more setup.

  • Lighthouse

    Automated audits for performance, accessibility, SEO and best practices.

    FreeOpen sourceWindowsmacOSLinuxWebCommand line

    sitespeed.io is an open-source CLI giving video, HAR waterfalls and Core Web Vitals, with long-term monitoring through your own Graphite or InfluxDB.

Similar software

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