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 |
|---|---|---|---|
| accompany.com | #6,265 | Amazon (ACM), Amazon Route 53, Font Awesome + 7 more | Find emails |
| cinemark.com | #6,535 | ASP.NET, Adyen, Azure API Management + 15 more | Find emails |
| gucci.com | #6,575 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 7 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| atg.se | #6,624 | Contentful, DigiCert, Dynatrace + 5 more | Find emails |
| arvixe.com | #6,682 | Adobe Experience Cloud (Launch), Cloudflare, Cloudflare Bot Management + 9 more | Find emails |
| callofduty.com | #6,725 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Akamai Edge DNS + 13 more | Find emails |
| invisalign.com | #7,048 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 8 more | Find emails |
| virginmedia.com | #7,170 | Google Cloud, Next.js, SpeedCurve + 1 more | Find emails |
| frontapp.com | #7,238 | Amazon CloudFront, Amazon Route 53, Cloudflare edge/CDN + 12 more | Find emails |
| uline.com | #7,256 | ASP.NET, Akamai Bot Manager, Akamai Edge DNS + 12 more | Find emails |
| salesforce-sites.com | #7,566 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| pingdom.com | #7,649 | Adobe Experience Cloud (Launch), Cloudflare, DigiCert + 13 more | Find emails |
| cengage.com | #7,737 | Amazon (ACM), Amazon CloudFront, Cloudflare edge/CDN + 12 more | Find emails |
| jet2holidays.com | #7,752 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Akamai edge/CDN + 10 more | Find emails |
| paychex.com | #7,870 | Akamai Edge DNS, Cloudflare edge/CDN, Datadog + 20 more | Find emails |
| freshservice.com | #7,926 | Amazon CloudFront, Amazon Route 53, Cloudflare Bot Management + 6 more | Find emails |
| ledger.com | #7,947 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 16 more | Find emails |
| oanda.com | #8,178 | Adobe Fonts (Typekit), Bootstrap, Cloudflare + 8 more | Find emails |
| humblebundle.com | #8,277 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 1 more | Find emails |
| pipedrive.com | #8,843 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 15 more | Find emails |
| embedly.com | #8,848 | Cloudflare, Cloudflare Bot Management, Cloudflare Web Analytics + 14 more | Find emails |
| premierbet.co.ao | #9,570 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 3 more | Find emails |
| petsmart.com | #9,603 | Adyen, Akamai Bot Manager, Akamai edge/CDN + 12 more | Find emails |
| springernature.com | #10,508 | Bluesky, Fastly, Google Analytics + 7 more | Find emails |
| equifax.com | #10,566 | Akamai Edge DNS, Bootstrap, Cloudflare edge/CDN + 6 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 →