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 |
|---|---|---|---|
| one.com | #2,131 | Let's Encrypt, Next.js, Varnish + 1 more | Find emails |
| acronis.com | #2,154 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 5 more | Find emails |
| archive.is | #2,156 | Let's Encrypt, Nginx, reCAPTCHA v2 | Find emails |
| #184 (Tranco) |
| Find emails |
| 5 | taboola.com | #187 (Tranco) | Find emails |
| #2,163 |
| Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 17 more |
| Find emails |
| earthlink.net | #2,214 | Ahrefs Analytics, Cloudflare, Cloudflare Bot Management + 9 more | Find emails |
| bestbuy.com | #2,219 | Akamai Bot Manager, Akamai edge/CDN, DigiCert + 5 more | Find emails |
| umbrella.com | #2,236 | Amazon CloudFront, Amplitude, Atlassian Cloud + 10 more | Find emails |
| archive.ph | #2,238 | Let's Encrypt, Nginx, reCAPTCHA v2 | Find emails |
| slate.com | #2,250 | Amazon Advertising, Amazon Route 53, DoubleClick (Google Ads) + 8 more | Find emails |
| traffmonetizer.com | #2,296 | Cloudflare, Font Awesome, Google Analytics + 7 more | Find emails |
| trustedstack.com | #2,307 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 10 more | Find emails |
| fliphtml5.com | #2,317 | Bootstrap, Cloudflare, Cloudflare Web Analytics + 12 more | Find emails |
| asana.com | #2,318 | Amazon Route 53, DoubleClick (Google Ads), Google Analytics + 8 more | Find emails |
| useinsider.com | #2,321 | Cloudflare, Cloudflare edge/CDN, DoubleClick (Google Ads) + 20 more | Find emails |
| constellix.com | #2,349 | Adobe Experience Cloud (Launch), DigiCert, Fastly + 8 more | Find emails |
| last.fm | #2,388 | Amazon Advertising, Blockthrough, Bluesky + 12 more | Find emails |
| clickup.com | #2,484 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 34 more | Find emails |
| scmp.com | #2,500 | Adobe Fonts, Adobe Fonts (Typekit), Amazon Advertising + 17 more | Find emails |
| home-assistant.io | #2,528 | Amazon CloudFront, Atlassian Cloud, Atlassian Statuspage + 12 more | Find emails |
| admatic.de | #2,532 | Cloudflare, Cloudflare edge/CDN, Fancybox + 8 more | Find emails |
| aarp.org | #2,604 | Adobe Advertising Cloud, Adobe Audience Manager, Adobe Experience Cloud (Launch) + 47 more | Find emails |
| prezi.com | #2,640 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 12 more | Find emails |
| archives.gov | #2,667 | AddToAny, Amazon CloudFront, Bootstrap + 7 more | Find emails |
| podbean.com | #2,719 | AOS, Bootstrap, Cloudflare + 17 more | Find emails |
| goguardian.com | #2,745 | AWS Lambda, Adobe Fonts (Typekit), Amazon CloudFront + 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 →