Lighthouse

Automated auditing tool for improving web page quality across performance, accessibility, progressive web apps, SEO, and best practices. You provide a URL and it runs a series of audits against the page, then generates a report with actionable recommendations. Each audit includes documentation on why it matters and how to fix issues.

Built by the Chrome team and integrated into Chrome DevTools and PageSpeed Insights. Lighthouse distinguishes itself by offering the same auditing engine across DevTools, command line, and Node.js, making it easy to add automated checks to CI pipelines while using identical audits in local development.

Core capabilities:

• Performance audits to measure page load speed and identify optimization opportunities
• Accessibility audits to ensure content and navigation work for all users
• Best Practices audits covering security, deprecated APIs, and browser console errors
• SEO audits for search engine visibility
• PWA audits for installability, service worker, and offline support
• Multiple run modes: Chrome DevTools, CLI, Node module, or PageSpeed Insights

Teams use Lighthouse to catch regressions before deployment, enforce performance budgets in CI, and guide developers toward faster and more accessible pages. It fits into existing tooling via npm integration and can audit both public pages and authenticated flows.