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Unlighthouse

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description Unlighthouse Overview

Unlighthouse is an open source command-line tool designed to assess website performance. It simulates browser behavior to measure critical metrics such as First Contentful Paint and Largest Contentful Paint. This allows developers, web designers, and site reliability engineers to identify and address bottlenecks slowing page load speed, ultimately improving user experience.

help Unlighthouse FAQ

How is Unlighthouse different from running Google Lighthouse in Chrome DevTools?

Chrome DevTools runs Lighthouse on one page at a time, while Unlighthouse is a command-line tool that crawls your entire site and generates Lighthouse reports for every discovered page in a single automated run. This makes it practical for auditing sites with dozens or hundreds of URLs that would be infeasible to test manually.

Can I integrate Unlighthouse into a GitHub Actions CI/CD pipeline?

Yes, Unlighthouse can be added as a step in GitHub Actions or similar CI/CD platforms to run performance audits on every build or pull request. You can configure scoring thresholds for Core Web Vitals metrics like Largest Contentful Paint and Cumulative Layout Shift to fail builds that regress performance.

Does Unlighthouse test both mobile and desktop performance?

Unlighthouse runs Lighthouse under the hood, so it supports both mobile and desktop device emulation presets. You can configure which form factor to scan or run both to generate separate performance scores for each viewport.

What output format does Unlighthouse generate for its reports?

Unlighthouse generates an interactive HTML dashboard that lists every scanned URL with sortable columns for Performance, Accessibility, Best Practices, and SEO scores, plus detailed drill-downs into individual Lighthouse audits. This static output can be hosted as a website or viewed locally in a browser.

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