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 |
|---|---|---|---|
| uxcam.com | #14,222 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 9 more | Find emails |
| cambridgeenglish.org | #14,239 | ASP.NET, Cloudflare, DigiCert + 12 more | Find emails |
| mywhc.ca | #14,248 | Bootstrap, ClickCease, Cloudflare edge/CDN + 19 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| toronto.ca | #14,263 | Amazon CloudFront, Bootstrap, Font Awesome + 6 more | Find emails |
| stockbit.com | #14,270 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 8 more | Find emails |
| slb.com | #14,286 | DigiCert, Google Fonts, Google Tag Manager + 7 more | Find emails |
| longisland.com | #14,320 | Cloudflare, Cloudflare Bot Management, Cloudflare Turnstile + 15 more | Find emails |
| bhf.org.uk | #14,329 | ASP.NET, Azure Front Door, CSC (Digital Brand Services) + 10 more | Find emails |
| questionpro.com | #14,333 | AdRoll, Bootstrap, Cloudflare + 16 more | Find emails |
| safer-networking.org | #14,344 | Apache, DigiCert, Matomo + 5 more | Find emails |
| cloudways.com | #14,369 | All in One SEO, Amazon CloudFront, Amazon S3 + 13 more | Find emails |
| parspack.net | #14,375 | Google Analytics, Google Tag Manager, Gravatar + 3 more | Find emails |
| appcues.com | #14,376 | AWS Lambda, Amazon CloudFront, Amazon Route 53 + 25 more | Find emails |
| monica.im | #14,401 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 11 more | Find emails |
| kuula.co | #14,415 | Amazon (ACM), Amazon Route 53, Apache + 3 more | Find emails |
| bark.us | #14,423 | Amazon (ACM), Amazon Route 53, Amplitude + 16 more | Find emails |
| sdamgia.ru | #14,432 | Cloudflare, DDoS-Guard, DoubleClick (Google Ads) + 9 more | Find emails |
| unblog.fr | #14,462 | Bootstrap, Google Analytics, InMobi + 4 more | Find emails |
| wmich.edu | #14,473 | Adobe Fonts (Typekit), Drupal, Fastly + 10 more | Find emails |
| livenation.com | #14,481 | Adobe Fonts, Adobe Fonts (Typekit), Akamai Edge DNS + 11 more | Find emails |
| nixplay.com | #14,492 | AdRoll, Amazon Route 53, Cloudflare edge/CDN + 9 more | Find emails |
| duetapp.net | #14,497 | AppsFlyer, Checkout.com, Google Cloud DNS + 7 more | Find emails |
| cartier.com | #14,499 | AB Tasty, Akamai Bot Manager, Akamai Edge DNS + 10 more | Find emails |
| cyberneticos.com | #14,521 | Cookiebot, Font Awesome, Google Analytics + 8 more | Find emails |
| labcorp.com | #14,529 | AOS, Adobe Experience Cloud (Launch), Adobe Experience Manager Edge Delivery (Helix RUM) + 17 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 →