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 |
|---|---|---|---|
| brookfield.com | #89,637 | Amazon Route 53, Drupal, Fastly + 7 more | Find emails |
| calvinklein.it | #89,650 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 10 more | Find emails |
| dbt.com | #90,346 | Adobe Fonts (Typekit), Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| invisalign.in | #91,505 | Amazon Route 53, Contentful, Google Tag Manager + 5 more | Find emails |
| taylorwessing.com | #91,733 | AOS, Azure API Management, Azure Front Door + 6 more | Find emails |
| heartfoundation.org.au | #91,832 | Cloudflare, Cloudflare edge/CDN, Contentstack + 6 more | Find emails |
| wonderbly.com | #91,871 | Amazon Route 53, Astro, Bugsnag + 6 more | Find emails |
| admiral.com | #92,159 | Adobe Experience Cloud (Launch), AppDynamics, Cloudflare + 9 more | Find emails |
| stage-entertainment.de | #92,220 | Adobe Fonts, Adobe Fonts (Typekit), Azure Front Door + 7 more | Find emails |
| startups.co.uk | #92,531 | Amazon Route 53, Fastly, Google Fonts + 7 more | Find emails |
| ccf.org | #92,627 | Adobe Experience Cloud (Launch), Cloudflare, Cloudflare Bot Management + 5 more | Find emails |
| canon.de | #92,776 | Akamai Edge DNS, Akamai edge/CDN, Akamai mPulse + 13 more | Find emails |
| candriam.com | #95,107 | Azure API Management, Cloudflare edge/CDN, Google Cloud DNS + 4 more | Find emails |
| vattenfall.se | #95,180 | Azure API Management, Azure Front Door, Consentmanager.net + 2 more | Find emails |
| macmillaneducation.com | #95,195 | Fastly, Google Analytics, Google Fonts + 7 more | Find emails |
| outrigger.com | #95,656 | Azure API Management, Cloudflare, Cloudflare edge/CDN + 5 more | Find emails |
| sabado.pt | #95,684 | Chartbeat, DoubleClick (Google Ads), Gemius + 11 more | Find emails |
| mindjet.com | #95,841 | Amazon Route 53, Apache, Bootstrap + 5 more | Find emails |
| equifax.co.uk | #96,364 | Akamai Edge DNS, Bootstrap, Google Tag Manager + 3 more | Find emails |
| tvh.com | #96,540 | Cloudflare edge/CDN, ConsentMo, Drupal + 7 more | Find emails |
| chainreactioncycles.com | #96,963 | Akamai Bot Manager, Akamai edge/CDN, Google Tag Manager + 4 more | Find emails |
| async.com | #97,084 | AWS Lambda, Amplitude, Cloudflare + 8 more | Find emails |
| brightgauge.co | #97,163 | Adobe Fonts, Adobe Fonts (Typekit), Amazon Route 53 + 16 more | Find emails |
| manycam.com | #97,200 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 10 more | Find emails |
| creditsesame.com | #97,416 | Amazon CloudFront, Amazon Route 53, DataDome + 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 →