Live deterministic tool
Core Web Vitals Checker
Run PageSpeed Insights for a submitted public URL and report real Lighthouse/Core Web Vitals metrics when available.
What this checks
Performance score
LCP
CLS
INP/TBT
FCP
PageSpeed errors
FAQ
Does this need an API key?
The adapter can run without a key until quota is hit. Set PAGESPEED_API_KEY for reliable production usage.
Are results mocked?
No. Results come from the PageSpeed Insights API or return a clear fetch error.