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Which analytics tools does the web ship?
We counted the code footprints that analytics and tag tools leave in page source, across the July 2026 SearchWebCode index of roughly 95 million unique-domain homepages. Each count is a verified substring match against the stored source — not an extrapolated estimate — and the populations overlap, so the rows can't be summed.
Analytics & tag tools by verified adoption (July 2026)
| Tool | Footprint | Domains |
|---|---|---|
| Google Analytics 4 | gtag/js?id=G- | 7,800,085 |
| Google Tag Manager | googletagmanager.com/gtm.js | 5,930,532 |
| Cloudflare Insights | cloudflareinsights.com | 5,245,359 |
| Universal Analytics | google-analytics.com/analytics.js | 3,554,799 |
| Meta Pixel | fbevents.js | 2,330,473 |
| Microsoft Clarity | clarity.ms/tag/ | 542,640 |
| Hotjar | static.hotjar.com/c/hotjar- | 305,941 |
What stands out
GA4's loader is the single most common analytics footprint at 7.8 million domains, ahead of the GTM container it often rides in (5.9M). Universal Analytics code still sits on 3.6 million homepages even though Google stopped collecting UA data in 2023 — a large population of un-migrated or abandoned installs, and a useful fingerprint for dating a site's last maintenance. Among session-replay tools, Microsoft Clarity (free) shows up on nearly twice as many domains as Hotjar.
Each link above opens a live results page with the footprint, current count, and sample sites; every number here can be re-run as a search and inspected result by result. For a specific cut — by TLD, by tool, or a full domain export — run the search or get in touch.