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.
Other a/b testing & personalization
| # | 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 |
|---|---|---|---|
| naturessunshine.com | #209,947 | Azure Front Door, DigiCert, Next.js + 5 more | Find emails |
| corec.jp | #210,082 | Bootstrap, Cloudflare, Cloudflare Bot Management + 10 more | Find emails |
| firstalert.com | #210,221 | Bazaarvoice, Cloudflare, Cloudflare edge/CDN + 10 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| tgen.org | #210,230 | AOS, ASP.NET, Cloudflare + 18 more | Find emails |
| levi.com.ph | #215,912 | Bazaarvoice, Cloudflare edge/CDN, Constructor.io + 9 more | Find emails |
| thinx.com | #216,213 | Attentive, Cloudflare edge/CDN, Global-e + 8 more | Find emails |
| masonite.com | #217,283 | Azure API Management, Cloudflare edge/CDN, Google Fonts + 6 more | Find emails |
| unfcu.org | #218,122 | Adobe Fonts (Typekit), Azure API Management, Brandfolder + 6 more | Find emails |
| healthitanalytics.com | #218,542 | Chartbeat, Cloudflare, Cloudflare edge/CDN + 7 more | Find emails |
| cunamutual.com | #218,886 | ASP.NET, Azure DNS, Azure Front Door + 12 more | Find emails |
| getalma.com | #218,927 | Amazon Route 53, Elementor, Font Awesome + 11 more | Find emails |
| magiclife.com | #219,100 | DigiCert, Microsoft 365, TYPO3 + 2 more | Find emails |
| aaalife.com | #219,284 | Bootstrap, Citrix NetScaler, Cloudflare + 14 more | Find emails |
| fcm.digital | #219,468 | Drupal, Fastly, Google Tag Manager + 6 more | Find emails |
| canon.es | #219,748 | Akamai Edge DNS, Akamai edge/CDN, Akamai mPulse + 13 more | Find emails |
| ice.no | #219,946 | ASP.NET, Azure API Management, Azure Front Door + 6 more | Find emails |
| indomco.fr | #219,974 | Azure Front Door, Bootstrap, Google Tag Manager + 5 more | Find emails |
| virginmedia.co.uk | #220,248 | Google Cloud, Next.js, SpeedCurve + 1 more | Find emails |
| whistleb.com | #220,422 | Cloudflare, Google Tag Manager, Let's Encrypt + 5 more | Find emails |
| waternet.nl | #220,701 | Azure API Management, Cloudflare edge/CDN, Google Tag Manager + 3 more | Find emails |
| bsnteamsports.com | #220,984 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 14 more | Find emails |
| cyncly.com | #221,378 | Azure API Management, Cloudflare, Cloudflare edge/CDN + 6 more | Find emails |
| claridges.co.uk | #221,455 | AudioEye, Azure API Management, Azure Front Door + 5 more | Find emails |
| conga.com | #222,732 | Cloudflare, Drupal, Fastly + 5 more | Find emails |
| berlinpackaging.com | #222,904 | BigCommerce, Bootstrap, Cloudflare Bot Management + 18 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 →