A live, timed fetch that checks the real technical factors behind Core Web Vitals — TTFB, compression, render-blocking resources, layout-shift risk, and more. Free, no signup, one page at a time.
Free plan · 1 page test at a timeThis free tool tests one page at a time. Run a complete audit to check backlinks, meta tags, mobile-friendliness, and more across your site.
Run Free Website AuditCore Web Vitals — Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) — are Google's metrics for how fast a page feels to a real visitor, and they factor into search rankings. Measuring the exact millisecond values for those metrics requires actually rendering the page in a browser, the way Google's own PageSpeed Insights and Chrome UX Report do. What this tool does instead is run a real, timed server-side fetch of your page and inspect the response the same way a browser would receive it: how long the server took to respond, whether the response is compressed, how many redirects it went through, how many resources block the page from rendering, and whether images are set up to avoid shifting the layout as they load. These are the concrete technical causes behind slow or unstable Core Web Vitals scores — fixing them is what actually moves the millisecond numbers.
This free version tests one page at a time and is meant for diagnosing a specific page you're optimizing. It doesn't simulate a real browser's rendering pipeline (JavaScript execution, paint timing, real network waterfalls), so it won't produce the exact LCP/INP/CLS figures Lighthouse reports — that requires a genuine browser-based test. Pair this tool with Google PageSpeed Insights or Chrome DevTools for the final rendered numbers, and use this one to quickly spot and fix the underlying technical issues first.