CAPTCHA & Bot Protection
91,344 of the 1,000,000 top sites in our Tranco top-1M census run reCAPTCHA (9.1%). Google's CAPTCHA/bot-scoring widget, the most widely deployed CAPTCHA by far. Detection is homepage-level HTML/header fingerprinting, so a site can run reCAPTCHA on other pages without it showing here.
Other captcha & bot protection
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | snapchat.com | #123 (Tranco) | Find emails |
| 2 | apache.org | #125 (Tranco) | Find emails |
| 3 | one.one | #160 (Tranco) | Find emails |
| 4 | w3.org |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| wttw.com | #27,803 | Adobe Fonts (Typekit), Bluesky, Bootstrap + 23 more | Find emails |
| wfmz.com | #27,804 | Amazon Advertising, Cloudflare, DoubleClick (Google Ads) + 10 more | Find emails |
| aktualne.cz | #27,817 | Cloudflare, Cloudflare Turnstile, Cloudflare edge/CDN + 7 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| skyandtelescope.org |
| #27,838 |
| AddThis, Cloudflare, Cloudflare edge/CDN + 17 more |
| Find emails |
| tapnative.com | #27,879 | AOS, AdRoll, Amazon Route 53 + 18 more | Find emails |
| digidip.net | #27,882 | Amazon (ACM), Amazon Route 53, Nginx + 1 more | Find emails |
| ecma-international.org | #27,885 | Apache, Google Analytics, Google Fonts + 6 more | Find emails |
| polygonscan.com | #27,888 | ASP.NET, Bootstrap, Cloudflare + 10 more | Find emails |
| naeyc.org | #27,895 | Cloudflare, Cloudflare edge/CDN, DoubleClick (Google Ads) + 13 more | Find emails |
| fotki.com | #27,906 | Bootstrap, Google Analytics, Google Tag Manager + 4 more | Find emails |
| bsc.es | #27,966 | Apache, Bluesky, Drupal + 4 more | Find emails |
| core77.com | #27,971 | ASP.NET, Cloudflare, Cloudflare Web Analytics + 9 more | Find emails |
| centralnic.com | #27,981 | Cloudflare edge/CDN, CookieYes, Google Trust Services + 4 more | Find emails |
| 3dos.io | #27,997 | AWS Lambda, Cloudflare, Cloudflare edge/CDN + 15 more | Find emails |
| creditsafe.com | #28,006 | AOS, Adobe Experience Cloud (Launch), Adobe Experience Manager Edge Delivery (Helix RUM) + 26 more | Find emails |
| talahost.com | #28,014 | LiteSpeed, PHP, reCAPTCHA v2 | Find emails |
| virusfree.cz | #28,024 | Apache, Django, Google Analytics + 3 more | Find emails |
| fashionphile.com | #28,027 | Algolia, Cloudflare, Cloudflare edge/CDN + 6 more | Find emails |
| tulsaworld.com | #28,033 | 33Across, Advertising.com, Amazon Advertising + 44 more | Find emails |
| towebs.com | #28,042 | Apache, Bootstrap, DigiCert + 12 more | Find emails |
| remarkable.com | #28,073 | Google Cloud DNS, Let's Encrypt, Next.js + 4 more | Find emails |
| myob.com | #28,083 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 13 more | Find emails |
| nexters.com | #28,089 | Amazon (ACM), Amazon Route 53, Google Workspace + 2 more | Find emails |
| webstarts.com | #28,096 | Amazon (ACM), Amazon Route 53, Apache + 11 more | Find emails |
| themewagon.com | #28,170 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 11 more | Find emails |
Showing the first 10,000matches — add a filter to narrow.
From the Crawlora Website Tech Stack Dataset, a homepage-level fingerprint of a 1,000,000-domain Tranco top-1M census (run top1m-2026-08-25-full-v2), snapshot August 29, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →