Chrome User Experience Report (CrUX) is Google's public dataset of real-user Core Web Vitals from Chrome users. StoreVitals continuously monitors your store's technical health alongside lab-tested Web Vitals — they're complementary data sources.
Use both. CrUX is the authoritative field-data source for Core Web Vitals — it's what Google uses for ranking, and there's no substitute for real-user data. Check it weekly via Search Console's Core Web Vitals report. StoreVitals is the right tool for everything CrUX doesn't do: lab-tested Web Vitals for any URL on demand, 25+ other technical health checks (broken links, schema, security headers, accessibility, missing meta tags), continuous monitoring with alerting, and recommendations on what to actually fix. The right ecommerce performance workflow is: monitor field data in Search Console (CrUX), diagnose with lab data in StoreVitals' Web Vitals Checker (https://store-vitals.com/tools/web-vitals), fix, validate with both. They cover opposite sides of the performance loop and neither replaces the other.