Core Web Vitals for any site
Real Chrome user data. Mobile + desktop. Historical trend. Free forever.
Examples: stripe.com · github.com · nytimes.com
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Popular guides
- Core Web Vitals explained (no developer jargon)LCP, INP, CLS — what they are, what "good" looks like, and whether they actually affect your Google rankings.
- What is Largest Contentful Paint (LCP)?Definition, thresholds, how LCP is measured, common causes of slow LCP, and fixes that actually move the number.
- What is Interaction to Next Paint (INP)?INP replaced FID in March 2024. Here is the new metric, the thresholds, and the specific patterns that cause slow INP.