Track Core Web Vitals across your entire site with zero setup
Calibre automatically monitors Google’s Chrome User Experience Report (CrUX) for your site.
Observe
No scripts, no setup. See what Google sees.
Calibre pulls Core Web Vitals data directly from Google’s Chrome User Experience Report for every site you track.
Core Web Vitals and more
Track key performance indicators like LCP, CLS, INP, FCP, TTFB.
Dashboard out of the box
Every site gets a CrUX Dashboard automatically. No integration, no scripts, no setup.
Device breakdown
See how performance differs across Desktop, Tablet, and Phone.
Pages
Find your slowest pages instantly
The Pages Leaderboard ranks all your discovered pages by Core Web Vitals. Sort, filter, and find the pages dragging down your site.
Automatic page discovery
Calibre spiders your site to find your most important pages. See Core Web Vitals for pages you didn't even know to check.
Ranked by impact
Pages are sorted by their Core Web Vitals scores. Focus on fixing the pages that hurt most.
Filter by device
See which pages fail on mobile but pass on desktop. Catch device-specific issues before they affect rankings.
Pass/Fail assessment
Know at a glance which pages pass Google’s Core Web Vitals thresholds and which don't.
Analyse
Understand why metrics are slow
Drill into each metric to understand what's causing poor scores. See trends, experience distribution, and LCP subparts.
LCP subparts breakdown
See exactly what's slowing your Largest Contentful Paint: image render delay, load duration, load delay, or TTFB.
Experience distribution
Know what percentage of users had a good, moderate, or poor experience. Track how it changes over time.
Up to 24 months of history
Spot long-term trends and correlate performance changes with releases or campaigns.
Metric deep-dives
Individual reports for LCP, CLS, INP, FCP, TTFB, and RTT. See which pages are worst for each metric.
Why monitor with CrUX data?
CrUX is the data Google uses to evaluate your site for Search ranking. Calibre makes it easy to track.
The data Google uses to rank you
CrUX feeds directly into Search rankings. Passing Core Web Vitals assessment here is what counts for SEO — not lab scores, not other RUM tools.
No scripts, no setup, no maintenance
Add a site and start seeing data. Unlike RUM, CrUX requires zero instrumentation — which also means zero risk of affecting page performance.
Monitor sites you don’t own
Track competitors, benchmark against industry peers, or monitor client sites before onboarding. Any public site with enough Chrome traffic has CrUX data.
Fresh data every week
Updated weekly from millions of real Chrome sessions. Spot trends, correlate with releases, and see up to 24 months of history.
Page-level detail with automatic discovery
Calibre spiders your site to find pages you didn't know to check. See which specific pages pass or fail — not just origin-level averages.
Works alongside RUM and Synthetic
CrUX tells you where you stand with Google. Pair it with RUM for deeper user insights and Synthetic for controlled diagnostics.
“Thanks to Calibre’s reporting, we were able to detect a massive downgrade in performance.”
Calibre CrUX is built for you
Included on all plans, for every site you monitor. No setup, no extra cost.
One platform for all web performance needs
Check first results in just a couple minutes. Start improving performance the same day.
