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 |
|---|---|---|---|
| zend.com | #2,462 | Amazon Route 53, Bootstrap, Drupal + 15 more | Find emails |
| webrootcloudav.com | #2,524 | Amazon Route 53, Google Tag Manager, Imperva + 4 more | Find emails |
| screenconnect.com | #2,547 | ASP.NET, Adobe Fonts (Typekit), Amazon Route 53 + 21 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| lgthinq.com | #2,627 | Akamai edge/CDN, Akamai mPulse, Datadog + 5 more | Find emails |
| prezi.com | #2,640 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 12 more | Find emails |
| evergage.com | #2,656 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| parallels.com | #2,715 | Amazon Route 53, Bootstrap, Cloudflare edge/CDN + 13 more | Find emails |
| huntress.io | #2,766 | Amazon Route 53, Builder.io, DigiCert + 10 more | Find emails |
| salesforce-scrt.com | #2,810 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| inmotionhosting.com | #2,852 | Cloudflare edge/CDN, Google Fonts, Google Tag Manager + 4 more | Find emails |
| tableau.com | #2,922 | Adobe Audience Manager, Akamai edge/CDN, Akamai mPulse + 20 more | Find emails |
| zapier.com | #2,974 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 8 more | Find emails |
| ctvnews.ca | #2,999 | Akamai edge/CDN, Akamai mPulse, Amazon Advertising + 18 more | Find emails |
| hootsuite.com | #3,123 | Amazon Route 53, Contentful, Google Tag Manager + 7 more | Find emails |
| starbucks.com | #3,143 | Azure API Management, Azure Front Door, Branch + 14 more | Find emails |
| ning.com | #3,199 | Amazon Route 53, Cloudflare Turnstile, Font Awesome + 13 more | Find emails |
| freshdesk.com | #3,211 | Amazon CloudFront, Amazon Route 53, Cloudflare Bot Management + 6 more | Find emails |
| smartsheet.com | #3,282 | Amazon CloudFront, Amazon Route 53, Amazon S3 + 7 more | Find emails |
| asos.com | #3,311 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 8 more | Find emails |
| foxbusiness.com | #3,393 | Adobe Audience Manager, Adobe Target, Amazon S3 + 14 more | Find emails |
| bitly.com | #3,417 | Amazon (ACM), Amazon Route 53, Cloudflare Bot Management + 13 more | Find emails |
| cvent.com | #3,511 | 6sense, Adobe Experience Cloud (Launch), Amazon (ACM) + 22 more | Find emails |
| wasabisys.com | #3,645 | DoubleClick (Google Ads), Let's Encrypt, NS1 + 5 more | Find emails |
| carfax.com | #3,941 | Amazon (ACM), Amazon CloudFront, Amazon S3 + 10 more | Find emails |
| channel4.com | #4,017 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 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 →