Monitor the same metrics Google uses to rank your site

Both come from the Chrome User Experience Report (CrUX), Google’s dataset of real Chrome user experiences. Calibre shows CrUX data for your whole site and for individual pages, by device, with charts covering up to 24 months.

PageSpeed Insights is a great way to check a single URL, and shows CrUX data for that URL or for your whole origin. Calibre scans your site to find its most important pages and tracks CrUX data for each of them, so you see performance across the whole site, page by page, and how it changes over time. Calibre also runs scheduled synthetic Lighthouse tests and Real User Monitoring, which add depth CrUX alone cannot: data for pages without enough traffic to appear in CrUX, results by country, device and browser, the page elements behind slow interactions, and Lighthouse audits that explain what to fix.

Core Web Vitals are part of the page experience signals Google uses in Search. They are one of several signals, so a fast site will not outrank more relevant content, but poor real-user experience is a risk worth monitoring.

No. CrUX data needs no tracking script and is included on every plan. Add your site and Calibre discovers your most important pages and matches them against the CrUX dataset, usually within 30 minutes. Pages need enough traffic to meet Google’s CrUX eligibility thresholds.

Yes. Add competitor sites to the same Team and Calibre ranks them side by side on CrUX real-user data and synthetic tests.

The CrUX Pages leaderboard shows which pages fail the Core Web Vitals assessment. Synthetic tests run Lighthouse on those pages, and each failed audit comes with specific recommendations you can pass to your developers.