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sitespeed.io

Repository: sitespeedio/sitespeed.ioHomepage

Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.

What sitespeed.io is

sitespeed.io is an open source tool for measuring web performance. It drives a real Firefox, Chrome, Edge or Safari browser, including Safari on an iPhone and Android phones over USB. Each run collects Core Web Vitals, video and visual metrics, a HAR waterfall, CPU and long-task data, and the Coach's advice. Results appear in an HTML report. It runs as a CLI installed from npm or as a Docker image that bundles Firefox, Chrome and Edge. Documented uses include one-off page audits, CI regression tests with performance budgets, and scheduled monitoring. Monitoring runs can send metrics to Graphite or InfluxDB for Grafana dashboards.

Written from the project's README, read .

Category
Performance and load testing
License
MIT
Language
JavaScript
Changelog
Releases on GitHub

Repository metrics

Repository metrics
Stars5,0301
Forks6241
Open issues and PRs1591
Contributors1381
Commits in the last 90 days1411
Last commit2026-09-111
Last releasev42.7.0, 2026-09-111
Fetched

1 Fetched from the GitHub or GitLab API on . Hover a value for its own date.

Status

activeLast commit within 90 days of the fetch date.

Computed from the last commit date and the archive flag on the fetch date. See the status rules.

Alternatives

Listed performance and load testing tools, same primary language first, then by GitHub stars. Each line gives one fact from the tool's documentation where it differs from sitespeed.io's, with its source.

  • Lighthouse: Test authoring format: Config file via --config-path; custom audits and gatherers written as extensions. source: README

  • autocannon: Test authoring format: Command-line options, or JavaScript through the programmatic API. source: README

  • k6: Test authoring format: Code (JavaScript test scripts run by an embedded engine). source: README

  • Locust: Test authoring format: Code (Python locustfiles). source: README

  • Vegeta: Test authoring format: Command-line tool reading targets files (http or JSON format), or Go code using the library. source: README

  • hey: Test authoring format: Command-line options per run (URL, method, headers, body). source: README

  • oha: Test authoring format: Command-line options per run; target URLs can be read from a file. source: README

  • Apache JMeter: Test authoring format: GUI test IDE with test plan recording from browsers or native applications. source: README

How to install

npm i -g sitespeed.io
From README, read .

Questions

Is sitespeed.io open source?

Yes. sitespeed.io is released under MIT, an OSI-approved license, as reported by the GitHub API on 2026-09-22.

Is sitespeed.io maintained?

On 2026-09-22, the last commit to the default branch was on 2026-09-11, so the listed status is active. Rule: Last commit within 90 days of the fetch date.

How many GitHub stars does sitespeed.io have?

5,030 stars on 2026-09-22, from the GitHub API. The number is refreshed at each monthly update.

What language is sitespeed.io written in?

The repository's primary language, as reported by the GitHub API, is JavaScript.

How do I install sitespeed.io?

The README gives this command: npm i -g sitespeed.io

Sources

  1. GitHub REST API: repository, read
  2. GitHub REST API: commits, read
  3. GitHub REST API: latest release, read
  4. GitHub REST API: contributors, read
  5. README, read