Core Web Vitals checker

Real Lighthouse and field data from Google PageSpeed Insights for your live URL: performance score, LCP, INP and CLS, with your server response time measured separately.

Measuring rankings in

Runs the full audit on your live site. Your report opens in your dashboard.

What this checks

This calls Google PageSpeed Insights for your URL on the mobile strategy and reports the Lighthouse performance score along with LCP, CLS and total blocking time. Where Chrome has enough real traffic on your site it also returns field data, the 75th percentile of what actual visitors experienced, which is the version that counts. Separately we measure your server response time ourselves, because that number is yours alone and is not diluted by anything the browser does afterwards.

Why it matters

Core Web Vitals is a live ranking input, and more practically it is a measure of whether people stay. It is also the audit area where invented numbers are most common, so this check either returns real data or returns nothing: when PageSpeed Insights is unavailable the result is marked as not measured rather than being filled with an estimate that would quietly change your score.

How to read a bad result

A Lighthouse score under 50 is a failure and between 50 and 89 is a warning. Read the field data first if it is present, because lab numbers come from a simulated device and can differ sharply from what your visitors get. Server response time over 600 milliseconds is worth fixing before anything on the front end, since every other metric starts counting only after the first byte arrives.

This page leads with one dimension, and the audit behind it is the whole engine: Visibility100x scores36 checks on every page it crawls, across crawlability, on page SEO, structured data, AI and GEO, content, media, performance and security. Running it here gives you the same report a paying customer gets, on a free account with no card.

Run the full audit See what the plans cost

Questions people ask

What are good Core Web Vitals scores?

Largest Contentful Paint under 2.5 seconds, Interaction to Next Paint under 200 milliseconds, and Cumulative Layout Shift under 0.1, all measured at the 75th percentile of real visits rather than on your own machine.

Why is there no field data for my site?

Chrome only reports field data once a URL has enough real traffic to be reported without identifying anyone. New and low traffic pages fall back to lab scores, which is normal and not a fault.

Do Core Web Vitals really affect rankings?

Yes, as a tiebreaker rather than a lever. They rarely move a page past better content, and they decide close calls, and they have a direct effect on conversion that has nothing to do with Google at all.