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 |
|---|---|---|---|
| homesite.com | #176,195 | Bootstrap, Concrete CMS, Font Awesome + 7 more | Find emails |
| marketingcloud.com | #176,612 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| diligentboards.com | #176,880 | Azure DNS, Let's Encrypt, Marketo + 6 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| performancehealth.com | #176,891 | Bootstrap, Cloudflare, DoubleClick (Google Ads) + 19 more | Find emails |
| classpass.fr | #177,344 | AppsFlyer, Braze, Cloudflare + 14 more | Find emails |
| airpointsstore.co.nz | #177,591 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 2 more | Find emails |
| policytech.com | #177,716 | Google Tag Manager, Let's Encrypt, Microsoft 365 + 4 more | Find emails |
| alaskaair.net | #178,522 | AppDynamics, Azure API Management, Azure Front Door + 5 more | Find emails |
| medthority.com | #178,858 | Azure API Management, Cloudflare edge/CDN, Google Trust Services + 2 more | Find emails |
| cartflows.com | #178,921 | AB Tasty, ActiveCampaign, AdRoll + 120 more | Find emails |
| stlukesonline.org | #179,124 | Adobe Fonts (Typekit), Cloudflare, Cloudflare edge/CDN + 4 more | Find emails |
| database.com | #179,167 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 12 more | Find emails |
| salesforce.org | #179,531 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 12 more | Find emails |
| chariot.net.au | #179,881 | Amazon (ACM), Apache, Cludo + 5 more | Find emails |
| unity.edu | #179,984 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 11 more | Find emails |
| visualforce.com | #181,524 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| insight.io | #181,671 | Amazon Route 53, Contentstack, Fastly + 7 more | Find emails |
| domainnetwork.net | #181,689 | Azure Front Door, Bootstrap, Google Tag Manager + 5 more | Find emails |
| am800cklw.com | #182,042 | Akamai edge/CDN, Akamai mPulse, Amazon Advertising + 18 more | Find emails |
| staysure.co.uk | #182,183 | Adobe Fonts (Typekit), Cloudflare, Cloudflare Bot Management + 9 more | Find emails |
| swyftx.com.au | #182,346 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 4 more | Find emails |
| euro909.com | #182,374 | Azure Front Door, Bootstrap, Google Tag Manager + 5 more | Find emails |
| khov.com | #182,450 | Azure Front Door, CSC (Digital Brand Services), DigiCert + 3 more | Find emails |
| nib.com.au | #182,668 | Cloudflare, Cloudflare edge/CDN, Google Trust Services + 3 more | Find emails |
| nextdayflyers.com | #182,714 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 12 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 →