CrUX History: Core Web Vitals Over Time
Is your site getting faster or slower for real visitors? This free CrUX History chart plots up to 40 weeks of real Chrome data in seconds: Core Web Vitals (LCP, CLS, INP) plus TTFB and FCP, for a whole site or one page, on phone or desktop.
This checked one URL, once.
VitalSentinel CrUX Monitoring keeps watching this around the clock, so you never have to run the check again. You hear about it the moment something changes.
Free plan, no credit cardWhat it checks
- Up to 40 weekly readings of LCP, CLS, INP, TTFB and FCP from the Chrome UX Report, about ten months of history
- Whether the most recent 28 days pass Google's Core Web Vitals assessment, and which metric fails if they do not
- The 75th percentile for every week, plus the share of visits that were good, needs improvement or poor
- A whole site or one exact URL, on phone or on desktop, one device type per run
What it does not
- No data is the normal state for a low-traffic site. It is not an error, and it is not a verdict on your speed
- Chrome only, and only visitors who opted in to sharing usage statistics with Google
- Every point covers the 28 days up to that week, so a fix takes about a month to show up in full
- It reports what your visitors experienced, never which image or script was responsible
Questions
- Why does it say there is no data for my site?
- The Chrome UX Report only publishes a page or a site once it has had enough qualifying visits in the last 28 days, and Google does not say what that number is, so there is no target to aim for. Most individual URLs never reach it. When a URL comes back empty we check the whole site as well and tell you whether widening the scope will return data, so you know whether it is this page or your traffic overall.
- Why is INP missing when LCP and CLS are there?
- INP needs interactions, not page loads. A page people read and then leave can collect plenty of visits without ever producing enough taps, clicks or key presses for Chrome to publish an INP value for it.
- Does this cover Safari and Firefox visitors?
- No. The Chrome UX Report is Chrome only. If a large share of your traffic is iPhone users on Safari, this data is missing them entirely, and measuring your own visitors with RUM is the only way to see them.
- How far back does CrUX history go?
- Google publishes at most 40 weekly readings here and adds one more every week. Each week covers the 28 days up to it, so neighboring weeks overlap heavily and a one-day spike gets smoothed away. Google keeps a longer history elsewhere, but only month by month and only for a whole site.
- How is this different from CrUX Vis?
- Both read the same public Chrome UX Report data, so the weekly numbers should agree. CrUX Vis is Google's own dashboard for that dataset and goes deeper if you want to slice it. This is the lighter alternative built around one question: paste a URL or a domain, pick phone or desktop, and get up to 40 weeks charted with a plain verdict on Core Web Vitals for the most recent 28 days. When a URL has no data we check the whole site too, so an empty result tells you whether the problem is that page or your traffic.
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6 per minute · 40 per hour · 150 per day per IP (per /64 for IPv6), plus a per-site limit
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