Free Core Web Vitals Checker vs Google PageSpeed Insights
Quick answer
Runs a real Lighthouse audit and reports LCP, CLS, and INP for a page, formatted for a quick read. Google PageSpeed Insights is different in scope — google's own performance testing tool (also free). Neither is trying to fully replace the other.
Free Core Web Vitals Checker
Runs a real Lighthouse audit and reports LCP, CLS, and INP for a page, formatted for a quick read.
Use it when: You want a fast lab-data read without digging through Google's fuller report.
Google PageSpeed Insights
The same underlying Lighthouse engine, plus real-world field data from the Chrome User Experience Report where available, and deeper diagnostic detail.
Use it when: You want field data (real visitor conditions) alongside lab data, or deeper diagnostics.