Free tool

Core Web Vitals Checker

Real Lighthouse data from Google PageSpeed Insights — the same signals that feed Google's own ranking system.

Running Next.js? Use the Next.js-specific version — same checker, plus what each metric usually means in a Next.js app.

FAQ

Is this a real Lighthouse run or an estimate?

A real run, on Google's own infrastructure, via the PageSpeed Insights API — the same engine behind Chrome DevTools' Lighthouse tab.

Why does it take a few seconds?

A full mobile Lighthouse run genuinely takes that long — there's no shortcut that keeps the numbers real.

What are good Core Web Vitals scores?

Google's thresholds: LCP under 2.5s, INP under 200ms, and CLS under 0.1 are all 'good.' Beyond those, LCP up to 4s, INP up to 500ms, and CLS up to 0.25 are 'needs improvement' — anything past that is 'poor.'

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