What is Web Vitals Leaderboard?

Web Vitals Leaderboard is a free web tool that compares your site's real-world performance against other sites in your industry. You enter a URL or origin, and it ranks that site against others using Core Web Vitals metrics drawn from Google's Chrome UX Report (CrUX). It's useful when you want a quick, competitive read on speed and user experience rather than a deep diagnostic audit.

What it does

The tool's stated purpose is to be "the simplest way to understand how your website's performance compares to other sites in your industry." Instead of showing you raw lab data, it pulls field data — measurements from actual Chrome users — and places your site in a ranked list.

The interface accepts a URL or origin, then displays a ranked table with these columns:

You can filter results by device category: All devices, Mobile, Desktop, or Tablet.

Where the data comes from

The leaderboard uses the Chrome UX Report API. According to the site's FAQ, CrUX "represents how real-world Chrome users experience popular destinations on the web" and aggregates metrics by origin and URL for sites known to Google's crawlers.

Two consequences follow from this:

• Only popular sites appear. CrUX covers origins with enough real-user traffic to meet Google's reporting thresholds. Low-traffic or new sites may return no data — the tool shows "Chrome UX report data not found!" in that case.
• Data is a 28-day rolling average. The FAQ states the report aggregates the past 28 days together, so a recent fix won't show up immediately, and a recent regression won't either.

How rankings are determined

The FAQ explains that ranking is driven primarily by LCP (Largest Contentful Paint), which measures when a user perceives the largest content of a page as visible — the time between page load starting and primary content rendering. The site notes that top-performing sites render LCP in about 1.2 seconds, and treats LCP as the most important metric for representing fast speed.

FCP, CLS, and INP are displayed alongside it, so you can see whether a strong or weak rank comes from paint timing, layout stability, or interactivity.

When to use it — and when not to

Good fit:

• You want a fast, competitive benchmark against industry peers.
• You need to justify performance work with real-user data rather than synthetic scores.
• You're tracking whether a change moved your origin's 28-day average.

Poor fit:

• Your site is new or low-traffic — CrUX likely has no data for it.
• You need per-page, per-element diagnostics. This is a leaderboard, not a profiler; use Lighthouse, PageSpeed Insights, or your own RUM for that.
• You need same-day feedback on a deploy. The 28-day rolling window smooths out short-term changes.

Practical notes

• Enter the origin (e.g. example.com) when you want site-wide comparison; a full URL targets that specific page if CrUX has URL-level data for it.
• If you get the "data not found" message, it's a coverage limit of CrUX, not an error in your input.
• The site is built by Guille Paz and offers a "Support Me!" link; no pricing or account requirements are stated on the page.