Core Web Vitals Checker
Check LCP, CLS, INP, FCP and TTFB for any URL on mobile and desktop. Uses Google's CrUX field data (real Chrome users) when available.
Frequently asked
Why does it say 'no-data' for new URLs?
CrUX field data requires enough real Chrome visits. For new pages we fall back to lab metrics (synthetic Lighthouse run) and label them clearly.
What's a passing Core Web Vital?
LCP ≤ 2.5s, CLS ≤ 0.1, INP ≤ 200ms. All three must pass for the URL to be 'Good'.