Core Web Vitals Checker

The data comes from Chrome User Experience Report (CrUX), a public dataset by Google that captures real-user experience metrics from Chrome browsers worldwide. Auditzy™ syncs this field data to generate historical Core Web Vitals reports.

Each report shows LCP, CLS, and INP/FID trends over six months at the 75th percentile — the threshold Google uses for Core Web Vitals evaluation. Green, amber, and red indicators help you see whether metrics are good, need improvement, or poor.

CrUX only includes URLs with enough Chrome traffic to meet Google's privacy thresholds. New sites, low-traffic pages, or recently launched URLs may not have sufficient data yet.

Choose Exact URL when you want to investigate a specific page, such as a homepage, product page, or landing page. Choose Domain for an origin-level view that combines eligible user experiences across the website. Checking both can reveal whether a problem is isolated to one page or affects the broader site.

Not exactly. Lighthouse runs a controlled lab test that helps diagnose potential performance issues at a specific moment. This checker focuses on CrUX field data collected from real Chrome users over time. Lab and field data complement each other: field data shows what visitors experienced, while lab tests help investigate why.

CrUX data is aggregated rather than live, so changes do not appear immediately after a deployment. A report reflects the latest field dataset available and its rolling measurement window. Continue monitoring after a release to confirm whether an improvement or regression persists as new visits are included.

Mobile visitors may use slower networks, less powerful devices, and different screen sizes than desktop visitors. Responsive layouts, image delivery, third-party scripts, and interaction patterns can also behave differently by device, so each experience should be reviewed independently.

The checker relies on public CrUX data, so private, authenticated, local, and most staging pages cannot be evaluated. Use a publicly accessible production URL with enough eligible Chrome traffic for the best chance of finding field data.

Core Web Vitals are part of Google's page experience signals. They do not guarantee rankings, but improving slow or unstable experiences can support both usability and technical SEO.

Focus on the metric in the worst bucket: optimize images and server response for LCP, reserve space for dynamic content to reduce CLS, and break up long JavaScript tasks to improve INP. Auditzy™ helps you track progress after each change.