Lighthouse

ELI5 — The Vibe Check

Lighthouse is Google's report card for your website. It grades you on speed, accessibility, SEO, and best practices. Getting all 100s is the developer equivalent of a perfect SAT score — rare, bragged about, and slightly obsessive.

Real Talk

Lighthouse is an open-source automated tool by Google that audits web pages for performance, accessibility, progressive web apps, SEO, and best practices. It runs in Chrome DevTools, CI pipelines, or via PageSpeed Insights and provides actionable improvement suggestions.

When You'll Hear This

"Our Lighthouse performance score dropped to 40 after that carousel was added" / "Run Lighthouse in CI so we catch regressions before deploy"