About Core Web Vitals
Free web performance analysis powered by Google PageSpeed Insights API
Our Mission
We believe every website deserves to be fast. Our mission is to make professional web performance analysis accessible to everyone – completely free. By leveraging the official Google PageSpeed Insights API, we provide the same data that Google uses to evaluate websites for search rankings.
What Are Core Web Vitals?
Core Web Vitals are a set of three specific metrics that Google considers essential for delivering a great user experience on the web. Since 2021, they have been official Google ranking factors, directly impacting your website's visibility in search results.
Largest Contentful Paint
Measures loading performance. How quickly the main content becomes visible.
Interaction to Next Paint
Measures interactivity. How responsive the page is when users interact with it.
Cumulative Layout Shift
Measures visual stability. How much the page layout shifts unexpectedly.
How It Works
When you submit a URL, we send it to the Google PageSpeed Insights API for analysis. Google's Lighthouse engine tests your page and returns detailed performance data, which we present in an easy-to-understand format.
Powered by Google PageSpeed Insights API
All performance data comes directly from Google's official PageSpeed Insights API. This ensures you get the same accurate, reliable data that Google uses to evaluate websites for its search rankings.
View official API documentationWhy Web Performance Matters
Website speed directly impacts user experience, conversion rates, and search engine rankings. Slow websites lose visitors, reduce engagement, and rank lower in search results.
By optimizing your Core Web Vitals, you can improve user satisfaction, increase conversions, and boost your organic search visibility.
of mobile users leave if loading takes more than 3 seconds
decrease in conversions for each additional second of load time
Core Web Vitals became a Google ranking factor
100% Free, No Registration Required
Our tool is completely free to use. No sign-up, no limits, no hidden costs. Simply enter a URL and get instant performance insights.
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