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Core web vitals tester

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seo tool

Core web vitals tester

Test Core Web Vitals across mobile and desktop.

TL;DR

Test Core Web Vitals across mobile and desktop. Run a full Core Web Vitals test on mobile and desktop profiles. Get LCP, INP, CLS, FCP and TTFB. Runs in the browser, no signup, no tracking of what you submit. Bookmark and come back.

Key takeaways

Free, no signup, runs locally in your browser.
Built for Indian SMBs, founders and SEO teams with India-tuned defaults.
Enter a URL.
Pick mobile or desktop.

How to use

Enter a URL.
Pick mobile or desktop.
Review the field and lab data.

What the output means

The output shows lab and field data side by side, plus a list of fixes ordered by impact.

Tool

Measures real-user CWV for this page. INP requires user interaction; the field will populate after you click / type.

Measuring for 5 seconds...

Thresholds

LCP good ≤ 2.5s, poor ≥ 4s
INP good ≤ 200ms, poor ≥ 500ms
CLS good ≤ 0.1, poor ≥ 0.25
FCP good ≤ 1.8s, poor ≥ 3s
TTFB good ≤ 800ms, poor ≥ 1.8s

About this tool

Run a full Core Web Vitals test on mobile and desktop profiles. Get LCP, INP, CLS, FCP and TTFB.

Frequently asked questions

Lab vs field data?

Lab data is from a synthetic run; field data is from real Chrome users. Both matter.

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