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Free · No sign-up · Core Web Vitals

Is your site fast? Find out in 30 seconds.

Drop a URL. We run Lighthouse and real Chrome field data, grade LCP, INP and CLS against Google's thresholds, and show you exactly what to fix first.

  • Lighthouse v11
  • CrUX real-user data
  • Mobile-first defaults
  • powered by NITRO engine
01

Paste any public URL

Homepage, PDP, checkout step — we scan the page as a real mobile visitor on simulated 4G.

02

Run the full audit in ~10s

Lighthouse v11, CrUX field data and a WebPageTest waterfall — no install, no signup.

03

Get a scored breakdown

Core Web Vitals, prioritised fix list and estimated revenue at risk — pipe results into our free ROI calculator.

Enter a URL above to get started
What it measures

Three numbers that decide Google's verdict.

◢ LCP

Largest Contentful Paint (LCP)

Measures loading performance. LCP should occur within 2.5 seconds of when the page first starts loading.

≤ 2.5s ≤ 4.0s > 4.0s
◢ INP

Interaction to Next Paint (INP)

Measures interactivity. INP should be 200 milliseconds or less for a good user experience.

≤ 200ms ≤ 500ms > 500ms
◢ CLS

Cumulative Layout Shift (CLS)

Measures visual stability. CLS should be 0.1 or less for a good user experience.

≤ 0.1 ≤ 0.25 > 0.25
How it works

How Core Web Vitals Work

  1. Enter your URL

    Paste any page URL to analyse its Core Web Vitals performance using real-world Chrome data.

  2. Review your scores

    See LCP, INP, and CLS scores with pass/fail indicators and comparison against Google's thresholds.

  3. Get recommendations

    Receive prioritised, actionable fixes to improve each metric and boost your search ranking.

  4. You get a fix list

    Prioritised audits with estimated impact in milliseconds — the faster ones go first.

Questions, honestly

Frequently asked questions about Core Web Vitals

What are Core Web Vitals?
Core Web Vitals are three metrics Google uses to measure real-world user experience: LCP (Largest Contentful Paint) measures loading speed, INP (Interaction to Next Paint) measures interactivity, and CLS (Cumulative Layout Shift) measures visual stability. They are a confirmed Google ranking factor since 2021.
What replaced FID as a Core Web Vital?
INP (Interaction to Next Paint) replaced FID (First Input Delay) in March 2024. While FID only measured the delay of the first interaction, INP measures the responsiveness of all interactions throughout the page lifecycle, making it a more comprehensive interactivity metric.
How do I check my Core Web Vitals?
Use Google PageSpeed Insights for per-URL analysis with both lab and field data. Google Search Console shows CWV status across your entire site. Chrome DevTools Lighthouse provides lab-only metrics. For real-user monitoring (RUM), use the web-vitals JavaScript library or tools like SpeedCurve.
What is a good LCP score?
Good: ≤ 2.5 seconds. Needs improvement: 2.5-4.0 seconds. Poor: > 4.0 seconds. LCP measures when the largest content element (image, video, or text block) becomes visible. Common causes of poor LCP: unoptimised images, render-blocking resources, slow server response time, and client-side rendering.
How do I fix a high CLS score?
Top fixes for CLS: (1) Always set width and height attributes on images and videos, (2) Reserve space for ads and embeds with CSS aspect-ratio or min-height, (3) Avoid inserting content above existing content dynamically, (4) Use CSS contain for layout containment, (5) Preload web fonts and use font-display: swap to prevent layout shifts from font loading.
Keep probing

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Speed is revenue

Speed tests are free. Shipping the fix is where NITRO comes in.

Paired engineering sprint that turns your audit into measurably faster pages — with rollback if it doesn't ship a win.

See the NITRO service Book a 15-min call
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