What is Lighthouse?
Google's open-source auditing tool that scores Performance, Accessibility, Best Practices, SEO, and PWA quality of a webpage.
Lighthouse runs in Chrome DevTools, as a CLI tool, and inside Google's PageSpeed Insights. It loads a page, runs ~150 audits, and gives you a 0–100 score in each of five categories. Performance includes Core Web Vitals; SEO checks for meta tags, robots.txt, mobile-friendly viewport, and similar; Accessibility checks for color contrast, alt text, ARIA usage; Best Practices flags console errors, deprecated APIs, mixed-content warnings; PWA validates manifest and service worker. A Lighthouse score of 90+ on Performance + SEO + Accessibility is the bar for a modern marketing site. InBuild's generated and exported sites hit 90+ across all four out of the box on most pages.