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Core Web Vitals Lookup

Enter a URL: the tool shows only real Chrome user data (28 days), with no lab test, and explains clearly when none exists.

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Privacy and cost

This tool runs a live check on our servers. Free accounts get 3 live checks per day in total across all such tools. We keep your report in your account so you can delete it any time.

How it works

You choose mobile or desktop, then the tool queries the PageSpeed Insights API to get the CrUX block.
Each metric is shown at the 75th percentile and compared with the official thresholds (LCP 2.5 s, INP 200 ms, CLS 0.1; FCP and TTFB as guidance).
URL-level and origin-level data are presented separately.

Example

An LCP of 4.2 s at the 75th percentile is rated "poor" (threshold: 4 s); a CLS of 0.05 is "good" (threshold: 0.1).

What the result means

The 75th percentile means 75% of page loads are better than the value shown. "No field data" is a normal state: the URL or site does not have enough Chrome traffic. It is neither an error nor a sign of poor performance.

Common problems this tool helps with

Not knowing whether a page's real Core Web Vitals are good.
Mixing up URL data with whole-site data.
A poor INP despite a good Lighthouse score.
Gaps between mobile and desktop.

Frequently asked questions

Why "no field data"?

CrUX only publishes data when Chrome traffic is sufficient. Small sites and recent pages often have none.

Where do these figures come from?

From the Chrome UX Report, through the PageSpeed Insights API response, over a rolling 28-day window.

Why no performance score here?

This tool deliberately shows real-user data only. The Lighthouse score is in the PageSpeed audit tool.