The Chrome UX Report (CrUX) is a public dataset of how real Chrome users experience websites. It reports Core Web Vitals and other metrics, such as TTFB and FCP, for pages and origins that have enough traffic, aggregated over a rolling 28-day window.
Lab data vs field data
Lighthouse is a lab test: one simulated device and network, run on demand. CrUX is field data from real visitors on real devices and networks. Lab data tells you what to fix and lets you test a change immediately. Field data tells you whether real visitors are having a good experience, and it is the data used to assess Core Web Vitals.
How CrUX reports results
CrUX reports the 75th percentile. A page passes Core Web Vitals when LCP, INP and CLS are all rated good at the 75th percentile. Pages without enough traffic have no page-level data; the origin (the whole site) may still have data.
AiroPages shows 75th percentile LCP, INP and CLS from CrUX next to lab scores where data exists.