Core Web Vitals checker
Enter a page. We ask Google's Chrome UX Report, the same real-user data Google uses in ranking, for the last 28 days: Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift, whether the page passes, and where the time goes. A page with too little traffic falls back to the whole site.
Free, no sign-up. Fetched from AskYourStack in Germany as the server sends the page (no JavaScript).
Field data, not a lab score
These numbers come from real Chrome users on your pages over 28 days. A page passes when at the 75th percentile LCP is 2.5 s or less, INP 200 ms or less and CLS 0.1 or less. A lab test (Lighthouse) is useful to find causes, but Google ranks on this field data.
Reading LCP's parts
When LCP is slow, its parts say where to look: a slow server response points at hosting, caching or the application; a long resource load delay means the main image is found late (lazy-loaded, set by script or not preloaded); a long load time means a heavy image; render delay means scripts or styles blocking the page.
With your AI
With AskYourStack your AI checks your top pages by clicks, runs a Lighthouse test for the causes, tracks the vitals over months, and on a server plan fixes server-side causes such as caching, compression and image formats.
Ask your AI instead
AskYourStack connects Claude, ChatGPT or Cursor to your Search Console, Google Analytics and the same page tools. Ask in plain words and it checks, compares and explains:
“Check Core Web Vitals on my top pages by clicks and tell me what slows them down and how to fix it.”
Start free Free plan: one Search Console site, no card.Questions
Why is there no data for my page?
Google only publishes pages and sites with enough Chrome visits. Then the whole site is tried; small sites may have none at all. Your AI can run a Lighthouse lab test instead.
Phones or desktop?
Google ranks on the phone data, so that is the default. Desktop is there to compare.
How many checks can I run?
Twelve an hour from one address. A free account lets your AI run them whenever you ask.