Check Core Web Vitals Once and Fix What Matters
What Are Core Web Vitals
Core Web Vitals are three Google ranking signals measured from real users visiting your site. LCP measures how long the largest visible element takes to load — it must be under 2.5 seconds. CLS measures unexpected layout movement — it must be under 0.1. INP measures how quickly your page responds to user interactions — it must be under 200ms.
Pages that fail these thresholds are actively penalised in rankings. Fixing Core Web Vitals failures is one of the most direct ranking improvements available.
What Our Core Web Vitals Checker Does
Our pay-as-you-go Core Web Vitals checker pulls real field data from the Google PageSpeed Insights API — the same data Google uses for ranking decisions. It scores your LCP, CLS and INP against Google thresholds for both mobile and desktop, identifies the exact cause of each failure and provides prioritised fix instructions.
For LCP it identifies render-blocking scripts and slow server responses. For CLS it finds images missing explicit width and height attributes. For INP it detects slow JavaScript blocking user interactions.
Core Web Vitals and PageSpeed Are Not the Same Thing
Core Web Vitals uses real field data from actual users. PageSpeed uses lab data from a controlled environment. You need both. Run our pay-as-you-go PageSpeed analyser alongside the Core Web Vitals checker for the complete picture. Read our guide on fixing your PageSpeed score without an agency to understand the right order to tackle performance issues.
Why You Do Not Need to Monitor Them Daily
Core Web Vitals field data updates on a 28-day rolling average. Run our checker after you make site changes, after fixing identified issues, or once a month as part of regular SEO maintenance. That is all you need.
How Much Does It Cost
Core Web Vitals checker runs cost from 8p. Run it on your five most important pages for less than 50p. Learn how SEO credits work at AIWebPageSEO before you top up.
Get Started
Top up SEO credits from 4.99 and run the pay-as-you-go Core Web Vitals checker on your most important pages today. Credits never expire.