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 |
|---|---|---|---|
| send2corrections.com | #328,143 | Adobe Audience Manager, Akamai Bot Manager, Akamai Edge DNS + 23 more | Find emails |
| cuddledown.com | #328,188 | ASP.NET, Akamai Bot Manager, Akamai edge/CDN + 10 more | Find emails |
| openlogic.com | #330,019 | Drupal, Fastly, Google Tag Manager + 9 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| genscape.com | #330,683 | Amazon Route 53, Azure API Management, Cloudflare edge/CDN + 7 more | Find emails |
| brandwatch.net | #330,713 | Bizible, CHEQ, Cloudflare + 10 more | Find emails |
| lanyon.com | #332,089 | 6sense, Adobe Experience Cloud (Launch), Amazon (ACM) + 16 more | Find emails |
| empowerly.com | #332,753 | Amazon (ACM), Amazon CloudFront, Amazon S3 + 8 more | Find emails |
| startwillow.com | #333,321 | AWS Lambda, Adobe Fonts (Typekit), Amazon CloudFront + 15 more | Find emails |
| sterlingcheck.com | #333,901 | Adobe Fonts (Typekit), Amazon Route 53, Amplitude + 20 more | Find emails |
| loftware.com | #334,031 | 6sense, Amazon Route 53, Azure API Management + 14 more | Find emails |
| oister.dk | #334,699 | Azure API Management, Azure Front Door, Cookie Information + 4 more | Find emails |
| bannersolutions.com | #334,758 | Cloudflare, DatoCMS, Google Tag Manager + 5 more | Find emails |
| admiralbet.es | #334,863 | DigiCert, Google Tag Manager | Find emails |
| greenmountainenergy.com | #335,571 | Adobe Experience Cloud (Launch), Amazon CloudFront, Amazon Route 53 + 7 more | Find emails |
| eigosapuri.jp | #335,599 | Amazon (ACM), Amazon Route 53, Google Tag Manager + 5 more | Find emails |
| gmesupply.com | #336,274 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| operon.pl | #336,841 | Cloudflare, Cloudflare edge/CDN, Google Analytics + 10 more | Find emails |
| hiscox.de | #337,384 | Azure API Management, Azure DNS, Cloudflare Bot Management + 5 more | Find emails |
| marchforbabies.org | #337,733 | ASP.NET, Bootstrap, Cloudflare + 15 more | Find emails |
| teamspeak3.com | #337,966 | AdRoll, Amazon (ACM), DoubleClick (Google Ads) + 6 more | Find emails |
| schengeninsurance.eu | #338,375 | CrazyEgg, DigiCert, Google Tag Manager + 2 more | Find emails |
| tivly.com | #338,430 | Amazon CloudFront, Amazon Route 53, Google Fonts + 4 more | Find emails |
| jaxtyres.com.au | #338,941 | ASP.NET, Afterpay, Azure API Management + 13 more | Find emails |
| canon-cna.com | #339,575 | Akamai Edge DNS, Akamai edge/CDN, Akamai mPulse + 13 more | Find emails |
| dexmedia.com | #339,709 | CHEQ, Cloudflare Bot Management, Cloudflare edge/CDN + 13 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 →