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 |
|---|---|---|---|
| sigmapool.com | #11,950 | Cloudflare, Google Fonts, Let's Encrypt + 1 more | Find emails |
| airarabia.com | #11,951 | Amazon Route 53, Azure API Management, Azure Front Door + 9 more | Find emails |
| is74.ru | #11,972 | Bitrix, Google Tag Manager, Mail.ru Analytics (Top100) + 6 more | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| usenix.org | #11,975 | Cloudflare, Cloudflare Web Analytics, Cloudflare edge/CDN + 6 more | Find emails |
| cloudfilter.net | #11,982 | Drupal, Google Analytics, Google Tag Manager + 5 more | Find emails |
| airbrake.io | #12,059 | AWS Lambda, Amazon CloudFront, Amazon Route 53 + 14 more | Find emails |
| cleverwebserver.com | #12,067 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 9 more | Find emails |
| pdffiller.com | #12,071 | Amazon Route 53, DigiCert, Google Fonts + 9 more | Find emails |
| gobiernodecanarias.org | #12,080 | Bootstrap, Font Awesome, Google Analytics + 11 more | Find emails |
| recombee.com | #12,089 | AOS, Adobe Fonts (Typekit), Cloudflare + 7 more | Find emails |
| siteground.com | #12,095 | Amazon CloudFront, Amazon S3, Cookiebot + 9 more | Find emails |
| angelone.in | #12,126 | AppsFlyer, Cloudflare, Cloudflare edge/CDN + 14 more | Find emails |
| 34sp.com | #12,153 | Adobe Fonts (Typekit), Bootstrap, Fathom + 10 more | Find emails |
| slideserve.com | #12,166 | Bootstrap, Fastly, Google AdSense + 10 more | Find emails |
| cloudconvert.com | #12,176 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 1 more | Find emails |
| gotomypc.com | #12,183 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 9 more | Find emails |
| exoclick.com | #12,202 | Cloudflare edge/CDN, Font Awesome, GitBook + 14 more | Find emails |
| ridewithvia.com | #12,218 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 9 more | Find emails |
| nutaku.net | #12,224 | Amazon Route 53, DebugBear, Google Tag Manager + 3 more | Find emails |
| indigo.ca | #12,230 | Akamai Edge DNS, Cloudflare edge/CDN, Constructor.io + 8 more | Find emails |
| rhombus.com | #12,241 | Amazon CloudFront, Amazon Route 53, Chatbase + 7 more | Find emails |
| elong.com | #12,242 | Akamai edge/CDN, Akamai mPulse, Let's Encrypt + 5 more | Find emails |
| gransy.com | #12,249 | Font Awesome, Google Analytics, Let's Encrypt + 5 more | Find emails |
| smtp2go.com | #12,274 | Bootstrap, Cloudflare Bot Management, Cloudflare edge/CDN + 11 more | Find emails |
| egihosting.com | #12,285 | Let's Encrypt, Nginx, WordPress + 3 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 →