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 |
|---|---|---|---|
| united.com | #4,209 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 1 more | Find emails |
| premierleague.com | #4,210 | Adobe Experience Cloud (Launch), Amazon (ACM), Amazon CloudFront + 9 more | Find emails |
| siteforce.com | #4,311 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 12 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| michaels.com | #4,365 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 10 more | Find emails |
| gitlab.io | #4,402 | Bizible, Cloudflare, Cloudflare edge/CDN + 6 more | Find emails |
| pardot.com | #4,555 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| carnival.com | #4,647 | ASP.NET, Akamai Bot Manager, Akamai Edge DNS + 8 more | Find emails |
| westernunion.com | #4,672 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Akamai edge/CDN + 15 more | Find emails |
| marksandspencer.com | #4,773 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 8 more | Find emails |
| freshworks.com | #4,824 | Amazon CloudFront, Amazon Route 53, Cloudflare Bot Management + 6 more | Find emails |
| jbhifi.com.au | #4,873 | Amazon Route 53, Cloudflare edge/CDN, Contentful + 12 more | Find emails |
| exacttarget.com | #4,951 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 12 more | Find emails |
| aclu.org | #5,151 | Cloudflare, Let's Encrypt, Pantheon + 2 more | Find emails |
| alaskaair.com | #5,245 | AppDynamics, Azure API Management, Azure Front Door + 6 more | Find emails |
| eventim.de | #5,274 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 9 more | Find emails |
| dndbeyond.com | #5,326 | Amazon Route 53, Amplience, Datadog + 11 more | Find emails |
| corel.com | #5,600 | Amazon Route 53, Apache, Bootstrap + 4 more | Find emails |
| tv2.no | #5,707 | Adnami, Akamai edge/CDN, Akamai mPulse + 12 more | Find emails |
| appfolio.com | #5,931 | Amazon (ACM), Amazon Route 53, Bizible + 4 more | Find emails |
| loggly.com | #5,959 | Adobe Experience Cloud (Launch), Amazon CloudFront, Amazon Route 53 + 20 more | Find emails |
| pointclickcare.com | #6,015 | Bizible, Chart.js, Cloudflare Bot Management + 12 more | Find emails |
| onepeloton.com | #6,032 | Adobe Fonts (Typekit), Cloudflare, Cloudinary + 10 more | Find emails |
| fourseasons.com | #6,106 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 7 more | Find emails |
| statefarm.com | #6,232 | Adobe Experience Manager Edge Delivery (Helix RUM), DigiCert, Next.js + 5 more | Find emails |
| cscdns.net | #6,259 | Azure Front Door, Bootstrap, Google Tag Manager + 2 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 →