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 |
|---|---|---|---|
| spiff.com | #160,298 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 13 more | Find emails |
| mergr.com | #160,335 | Amazon (ACM), Amazon CloudFront, Amazon Route 53 + 13 more | Find emails |
| indomco.net | #160,517 | Azure Front Door, Bootstrap, Google Tag Manager + 5 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| calvinklein.fr | #160,547 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 10 more | Find emails |
| intheswim.com | #161,092 | Affirm, Amplience, Cloudflare edge/CDN + 12 more | Find emails |
| blazemeter.com | #161,173 | Amazon CloudFront, Atlassian Cloud, Atlassian Statuspage + 21 more | Find emails |
| healthitsecurity.com | #161,297 | Chartbeat, Cloudflare, Cloudflare edge/CDN + 7 more | Find emails |
| emaint.com | #161,601 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 7 more | Find emails |
| healthypawspetinsurance.com | #162,439 | Adobe Experience Manager Edge Delivery (Helix RUM), Adobe Fonts (Typekit), Cloudflare + 10 more | Find emails |
| cancer.dk | #162,684 | Azure API Management, Cloudflare edge/CDN, Cookie Information + 2 more | Find emails |
| 2020spaces.com | #162,703 | Azure API Management, Cloudflare, Cloudflare edge/CDN + 4 more | Find emails |
| plushcare.com | #163,480 | Ahrefs Analytics, Cloudflare, Cloudflare Bot Management + 15 more | Find emails |
| polynesia.com | #163,508 | Azure API Management, BrightEdge, Cloudflare edge/CDN + 8 more | Find emails |
| bndzgl.com | #163,802 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 8 more | Find emails |
| identityiq.com | #163,977 | AWS Lambda, Apple Pay, Cloudflare edge/CDN + 16 more | Find emails |
| baxalta.com | #164,826 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN + 6 more | Find emails |
| wowinc.com | #165,103 | Amazon CloudFront, Amazon Route 53, Cloudflare Bot Management + 6 more | Find emails |
| reliant.com | #165,119 | Adobe Experience Cloud (Launch), Amazon CloudFront, Amazon Route 53 + 10 more | Find emails |
| walk.sc | #165,564 | Amazon (ACM), Amazon Route 53, Foundation + 5 more | Find emails |
| bestwaywholesale.co.uk | #165,783 | Civic Cookie Control, Google Tag Manager, Hotjar + 9 more | Find emails |
| turners.co.nz | #166,465 | Amazon Route 53, Font Awesome, Google Tag Manager + 1 more | Find emails |
| stcusa.com | #166,639 | Amazon Route 53, Awin, Cloudflare Bot Management + 11 more | Find emails |
| smileback.com | #166,962 | Adobe Fonts, Adobe Fonts (Typekit), Amazon Route 53 + 16 more | Find emails |
| katespade.jp | #167,075 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 11 more | Find emails |
| selfstorage.com | #167,420 | Cloudflare, Cloudflare Bot Management, Cloudflare edge/CDN + 8 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 →