A/B Testing & Personalization
1,843 of the 1,000,000 top sites in our Tranco top-1M census run Optimizely (0.2%). An experimentation platform for running A/B tests and personalizing website content. Detection is homepage-level HTML/header fingerprinting, so a site can run Optimizely on other pages without it showing here.
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | bit.ly | #102 (Tranco) | Find emails |
| 2 | bbc.com | #210 (Tranco) | Find emails |
| 3 | hp.com | #270 (Tranco) | Find emails |
| 4 | salesforce.com |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| wexhealthinc.com | #435,524 | Azure DNS, Google Tag Manager, Imperva + 6 more | Find emails |
| tempomeals.com | #435,721 | Amplitude, Cloudflare, Cloudflare Bot Management + 9 more | Find emails |
| worldredeye.com | #436,946 | Adobe Fonts (Typekit), Apache, Cloudflare Bot Management + 8 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| audionova.com | #439,232 | Ahrefs Analytics, Amazon Route 53, Azure API Management + 13 more | Find emails |
| ninjapatches.com | #440,593 | AdRoll, Amazon Route 53, Cloudflare edge/CDN + 23 more | Find emails |
| hataractive.jp | #443,127 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 7 more | Find emails |
| mountnittany.org | #443,236 | ASP.NET, Next.js, Vercel + 2 more | Find emails |
| topschooljobs.org | #443,490 | AWS WAF, Adobe Experience Cloud (Launch), Adobe Fonts (Typekit) + 11 more | Find emails |
| rodneybaileyproofs.com | #444,738 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN + 3 more | Find emails |
| clevelandcliniclondon.uk | #445,513 | Adobe Experience Cloud (Launch), Cloudflare, Cloudflare edge/CDN + 4 more | Find emails |
| swiftcover.com | #445,551 | AOS, Azure API Management, Azure Front Door + 8 more | Find emails |
| bradfordtaxinstitute.com | #446,555 | ASP.NET, Amazon (ACM), Amazon Route 53 + 8 more | Find emails |
| moltonbrown.com | #446,998 | Amplience, Cloudflare edge/CDN, Dynatrace + 9 more | Find emails |
| prismm.com | #447,220 | ASP.NET, AWS Lambda, Adobe Experience Cloud (Launch) + 23 more | Find emails |
| zpr.io | #447,449 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 10 more | Find emails |
| halebop.se | #448,417 | Adyen, Amazon CloudFront, Amazon S3 + 17 more | Find emails |
| tomorrowsworld.org | #448,793 | Bootstrap, Cloudflare, Cloudflare Web Analytics + 18 more | Find emails |
| cengage.uk | #450,346 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 11 more | Find emails |
| jphyundaisurrey.com | #451,138 | Amazon (ACM), Amazon CloudFront, Apache + 9 more | Find emails |
| emdmillipore.com | #451,425 | Akamai Bot Manager, Akamai edge/CDN, DigiCert + 6 more | Find emails |
| southamptonairport.com | #451,479 | Adobe Fonts (Typekit), Cloudflare edge/CDN, Cookiebot + 7 more | Find emails |
| canon.pl | #453,389 | Akamai Edge DNS, Akamai edge/CDN, Akamai mPulse + 13 more | Find emails |
| evermoreresort.com | #454,320 | Drupal, Fastly, Let's Encrypt + 6 more | Find emails |
| ehrintelligence.com | #454,722 | Chartbeat, Cloudflare, Cloudflare edge/CDN + 7 more | Find emails |
| dufresne.ca | #454,922 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 7 more | Find emails |
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 →