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 |
|---|---|---|---|
| bandzoogle.com | #76,863 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 7 more | Find emails |
| homecredit.ph | #76,891 | AOS, AppsFlyer, Bootstrap + 15 more | Find emails |
| hdsupplysolutions.com | #77,114 | Adobe Experience Cloud (Launch), Cloudflare, Cloudflare Bot Management + 6 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| equifax.ca | #77,266 | Akamai Edge DNS, Bootstrap, Google Tag Manager + 5 more | Find emails |
| odbm.org | #77,280 | Azure API Management, Cloudflare, Cloudflare edge/CDN + 2 more | Find emails |
| pattersondental.com | #77,518 | ASP.NET, Azure API Management, Azure DNS + 4 more | Find emails |
| fisher-price.com | #78,031 | Adobe Fonts (Typekit), Bazaarvoice, Cloudflare edge/CDN + 11 more | Find emails |
| indomco.com | #78,478 | Azure Front Door, Bootstrap, Google Tag Manager + 5 more | Find emails |
| g5.com | #78,636 | Amazon Advertising, DigiCert, Google Fonts + 11 more | Find emails |
| bbcearth.com | #79,760 | Drupal, Let's Encrypt, Next.js + 4 more | Find emails |
| grove.co | #80,566 | Bazaarvoice, Cloudflare, Cloudflare Bot Management + 12 more | Find emails |
| crocs.fr | #81,379 | Algolia, Azure DNS, Braintree + 11 more | Find emails |
| starbucks.ca | #81,540 | Azure API Management, Azure Front Door, Branch + 15 more | Find emails |
| wexphotovideo.com | #82,170 | ASP.NET, Azure API Management, Bootstrap + 14 more | Find emails |
| cn.edu | #82,336 | Adobe Fonts (Typekit), Bootstrap, BugHerd + 20 more | Find emails |
| gigapan.com | #82,593 | Apache, Blogger, DoubleClick (Google Ads) + 9 more | Find emails |
| ashleyhomestore.ca | #83,021 | Cloudflare, Cloudflare edge/CDN, Google Ads Conversion + 8 more | Find emails |
| driversupport.com | #83,240 | Azure API Management, Azure DNS, Azure Front Door + 20 more | Find emails |
| iheartradio.ca | #83,250 | Akamai edge/CDN, Akamai mPulse, Amazon Advertising + 18 more | Find emails |
| axa.co.uk | #84,027 | Azure API Management, Cloudflare edge/CDN, Dynatrace + 2 more | Find emails |
| levi.jp | #84,357 | AOS, Braze, Cloudflare edge/CDN + 13 more | Find emails |
| millicast.com | #84,405 | AddToAny, Amazon Route 53, Cloudflare Bot Management + 9 more | Find emails |
| pillrplatform.com | #85,869 | Azure DNS, Google Tag Manager, Let's Encrypt + 3 more | Find emails |
| carfax.io | #85,971 | Amazon (ACM), Amazon CloudFront, Amazon S3 + 8 more | Find emails |
| coveredca.com | #87,667 | ASP.NET, Amazon CloudFront, Apache + 10 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 →