Core Web Vitals
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Core Web Vitals

Real Largest Contentful Paint, First Input Delay, and Cumulative Layout Shift for any page, plus an optional full Google Lighthouse report. 2 credits per check, 3 for Lighthouse.

Real measurement, not lab estimates

Runs the page with actual JS + browser rendering, so LCP/FID/CLS reflect real experience, not a formula guess.

Health score at a glance

One overall score plus TTFB, DOM complete, and time-to-interactive timings.

Optional full Lighthouse audit

Performance, accessibility, best practices, and SEO scores, plus a prioritized list of fixes.

Revuin's Core Web Vitals checker gets real LCP, FID, and CLS measurements for any page in seconds, plus an optional full Google Lighthouse report — the same metrics Google uses as a ranking signal, without needing to set up PageSpeed Insights or Lighthouse yourself.

Why use Revuin's Core Web Vitals

  • ✓Get real Core Web Vitals in seconds with the instant check, or a full Lighthouse report when you need more depth.
  • ✓Covers performance, accessibility, best practices, and SEO scores in one Lighthouse run.
  • ✓Free instant check, no signup required.
  • ✓Works on any public page — yours or a competitor's.

How it works

  1. 1

    Enter a page URL

    Any public page you want Core Web Vitals for.

  2. 2

    Run the instant check

    Get real LCP, FID, and CLS in seconds.

  3. 3

    Run a full Lighthouse report (optional)

    See performance, accessibility, best practices, and SEO scores together.

Frequently asked questions

What are Core Web Vitals?+

LCP (Largest Contentful Paint, loading speed), FID/INP (interactivity responsiveness), and CLS (Cumulative Layout Shift, visual stability) — three metrics Google uses as page experience ranking signals.

What's a good Core Web Vitals score?+

Google generally considers LCP under 2.5s, INP under 200ms, and CLS under 0.1 as 'good' — anything beyond that falls into 'needs improvement' or 'poor.'

Is this free to use?+

Yes — the instant check is free, no signup required. The full Lighthouse report costs a small number of credits.

Can I check a competitor's page speed?+

Yes — this works on any public URL.

People also ask

Do Core Web Vitals actually affect Google rankings?+

Yes — Google has confirmed page experience, including Core Web Vitals, is a ranking factor, though strong content and relevance still matter far more overall.

How do I improve my LCP score?+

Optimizing images, reducing server response time, and eliminating render-blocking resources are the most common fixes for a slow Largest Contentful Paint.

What causes a poor CLS score?+

Images or ads without reserved space, and dynamically injected content that shifts layout after the initial render, are the most common causes of Cumulative Layout Shift issues.