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 |
|---|---|---|---|
| jcb.com | #61,205 | Amazon Route 53, Azure API Management, Cloudflare edge/CDN + 3 more | Find emails |
| studysapuri.jp | #61,261 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 13 more | Find emails |
| eposaudio.com | #61,786 | Azure API Management, Azure DNS, Cloudflare edge/CDN + 8 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| ethoslife.com | #61,858 | Amazon CloudFront, Cloudflare, Cloudflare edge/CDN + 13 more | Find emails |
| haisha-yoyaku.jp | #62,005 | Akamai Edge DNS, Akamai edge/CDN, Akamai mPulse + 10 more | Find emails |
| naacpldf.org | #62,023 | AppNexus, Bootstrap, Cloudflare + 19 more | Find emails |
| suncountry.com | #62,101 | Azure DNS, Google Fonts, Imperva + 2 more | Find emails |
| welcomesoftware.com | #62,415 | Amazon Route 53, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| admiralbet.it | #62,780 | ASP.NET, Akamai Bot Manager, Akamai edge/CDN + 8 more | Find emails |
| komplett.no | #63,495 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 10 more | Find emails |
| tomfordbeauty.com | #63,580 | Cloudflare edge/CDN, Let's Encrypt, OneTrust + 1 more | Find emails |
| elsevier.nl | #63,689 | Amazon CloudFront, Cloudflare Bot Management, Cloudflare edge/CDN + 8 more | Find emails |
| jbhifi.co.nz | #63,718 | Amazon Route 53, Cloudflare edge/CDN, Contentful + 11 more | Find emails |
| maybelline.com | #63,998 | Azure API Management, Cloudflare, Cloudflare edge/CDN + 9 more | Find emails |
| wasabi.com | #64,112 | DoubleClick (Google Ads), Let's Encrypt, Microsoft 365 + 6 more | Find emails |
| convatec.com | #64,129 | Azure API Management, CSC (Digital Brand Services), Cloudflare edge/CDN + 6 more | Find emails |
| canon.co.uk | #64,205 | Akamai Edge DNS, Akamai edge/CDN, Akamai mPulse + 13 more | Find emails |
| uline.ca | #64,483 | ASP.NET, Akamai Bot Manager, Akamai Edge DNS + 10 more | Find emails |
| silversneakers.com | #64,784 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 17 more | Find emails |
| audius.co | #64,929 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 4 more | Find emails |
| kofc.org | #65,110 | Azure API Management, Bootstrap, Cloudflare edge/CDN + 8 more | Find emails |
| roadscholar.org | #65,247 | Cloudflare edge/CDN, DigiCert, Google Tag Manager + 3 more | Find emails |
| architectsjournal.co.uk | #65,496 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Amazon (ACM) + 15 more | Find emails |
| coveralls.io | #65,864 | Adobe Fonts (Typekit), Amazon CloudFront, Atlassian Cloud + 17 more | Find emails |
| amartfurniture.com.au | #66,374 | Azure DNS, Cloudflare edge/CDN, Constructor.io + 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 →