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 |
|---|---|---|---|
| sharpspring.com | #184,761 | Bootstrap, Cloudflare Bot Management, Cloudflare edge/CDN + 10 more | Find emails |
| cortland.com | #185,202 | Apache, Google Analytics, Google Tag Manager + 4 more | Find emails |
| ajaxian.com | #185,534 | Chartbeat, Cloudflare edge/CDN, DoubleClick (Google Ads) + 6 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| folkspel.se | #186,220 | Consentmanager.net, Google Tag Manager, Microsoft 365 + 2 more | Find emails |
| coloniaexpress.com | #186,347 | Azure API Management, Azure DNS, Cloudflare edge/CDN + 5 more | Find emails |
| rest.com.au | #186,361 | Akamai Bot Manager, Akamai edge/CDN, Amazon (ACM) + 13 more | Find emails |
| generationtux.com | #186,916 | Amazon (ACM), Amazon Route 53, Cookiebot + 7 more | Find emails |
| perthmint.com | #187,153 | Azure API Management, Azure DNS, ClickTale (Contentsquare) + 16 more | Find emails |
| weltsparen.de | #187,552 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 5 more | Find emails |
| petolo.de | #188,310 | AWS Lambda, Amazon (ACM), Amazon CloudFront + 10 more | Find emails |
| phonepower.com | #188,315 | ASP.NET, AddThis, Bootstrap + 11 more | Find emails |
| chefswarehouse.com | #188,324 | ASP.NET, Azure API Management, Cloudflare edge/CDN + 5 more | Find emails |
| reftagger.com | #188,566 | Amazon Route 53, Azure API Management, Google Fonts + 3 more | Find emails |
| opploans.com | #188,625 | AWS WAF, Amazon (ACM), Amazon CloudFront + 14 more | Find emails |
| insightvacations.com | #189,307 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 5 more | Find emails |
| erado.net | #189,679 | Google Tag Manager, Let's Encrypt, Next.js + 2 more | Find emails |
| light-speed.com | #189,991 | Google Analytics, Sectigo, jQuery | Find emails |
| runscope.com | #190,979 | Amazon Route 53, Atlassian Statuspage, Drupal + 13 more | Find emails |
| intoxalock.com | #190,995 | ASP.NET, Azure API Management, Cloudflare + 14 more | Find emails |
| betashares.com.au | #191,295 | Amazon Route 53, Braze, BugHerd + 11 more | Find emails |
| grabone.co.nz | #191,569 | Algolia, Amazon Route 53, Bugsnag + 19 more | Find emails |
| boardvitals.com | #194,020 | Cloudflare, Cloudflare Bot Management, Cloudflare Turnstile + 16 more | Find emails |
| rmcad.edu | #194,060 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 12 more | Find emails |
| thecloud.net | #195,688 | Adobe Experience Cloud (Launch), Akamai Bot Manager, Akamai edge/CDN + 5 more | Find emails |
| cchs.net | #197,592 | Adobe Experience Cloud (Launch), Cloudflare, Cloudflare Bot Management + 7 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 →