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 |
|---|---|---|---|
| prestoplayer.com | #651,260 | AB Tasty, ActiveCampaign, AdRoll + 119 more | Find emails |
| dakvenster.nl | #651,300 | ASP.NET, CSC (Digital Brand Services), DigiCert + 9 more | Find emails |
| canon.be | #651,583 | Akamai Edge DNS, Akamai edge/CDN, Akamai mPulse + 15 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| zimmermannwear.com | #651,609 | Adobe Experience Manager Edge Delivery (Helix RUM), Cloudflare, CrazyEgg + 13 more | Find emails |
| escaladesports.com | #651,844 | Adobe Fonts (Typekit), Amazon Route 53, Bazaarvoice + 14 more | Find emails |
| ovstravel.com | #652,132 | Azure API Management, Azure DNS, Font Awesome + 6 more | Find emails |
| axainsurance.com | #652,156 | Azure API Management, Cloudflare edge/CDN, Dynatrace + 2 more | Find emails |
| awrusa.com | #652,681 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 5 more | Find emails |
| sigma-aldrich.com | #653,593 | Akamai Bot Manager, Akamai edge/CDN, DigiCert + 6 more | Find emails |
| traditional-odb.org | #655,376 | Amazon Route 53, Azure API Management, Cloudflare edge/CDN + 2 more | Find emails |
| unicef.se | #656,534 | Contentful, Let's Encrypt, Microsoft 365 + 4 more | Find emails |
| new-line.com | #656,755 | ASP.NET, Bootstrap, Cloudflare + 9 more | Find emails |
| wm.store | #658,315 | Amazon Route 53, Fastly, Google Analytics + 9 more | Find emails |
| falck.dk | #659,151 | Cookie Information, Google Tag Manager, Microsoft 365 + 4 more | Find emails |
| washingtondceventphotographers.com | #659,409 | Cloudflare Bot Management, Cloudflare Turnstile, Cloudflare edge/CDN + 3 more | Find emails |
| relocatemagazine.com | #660,050 | Apache, Cloudflare, DoubleClick (Google Ads) + 10 more | Find emails |
| humble.com | #661,958 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| clearreview.com | #662,416 | Amazon Route 53, Google Tag Manager, Let's Encrypt + 7 more | Find emails |
| justrussel.fr | #663,893 | Apache, Didomi, Google Cloud DNS + 9 more | Find emails |
| educode.com | #664,811 | Amazon CloudFront, Cloudflare, Cloudflare Bot Management + 8 more | Find emails |
| myparallels.com | #665,348 | Cloudflare, Cloudflare edge/CDN, Google Trust Services | Find emails |
| proofreadingservices.com | #666,698 | AdRoll, AddThis, Bootstrap + 19 more | Find emails |
| prepkitchen.co.uk | #666,763 | Cloudflare, Cookiebot, Let's Encrypt + 5 more | Find emails |
| pulsd.com | #666,866 | Adobe Fonts (Typekit), Amazon (ACM), Amazon Route 53 + 15 more | Find emails |
| netsearchers.com | #667,136 | Azure Front Door, Bootstrap, Google Tag Manager + 5 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 →