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 |
|---|---|---|---|
| bit.ly | #102 | Amazon (ACM), Amazon Route 53, Foundation + 7 more | Find emails |
| bbc.com | #210 | Fastly, Next.js, Piano + 4 more | Find emails |
| hp.com | #270 | Adobe Experience Cloud (Launch), Adobe Experience Manager Edge Delivery (Helix RUM), Adobe Target + 16 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| salesforce.com |
| #274 |
| Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 12 more |
| Find emails |
| gitlab.com | #393 | Bizible, Cloudflare, Cloudflare edge/CDN + 6 more | Find emails |
| klaviyo.com | #597 | Amazon Route 53, Astro, Cloudflare edge/CDN + 8 more | Find emails |
| force.com | #645 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 12 more | Find emails |
| optimizely.com | #667 | Cloudflare, Google Tag Manager, Let's Encrypt + 4 more | Find emails |
| mailchimp.com | #673 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 10 more | Find emails |
| mailchi.mp | #925 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 10 more | Find emails |
| typeform.com | #926 | AWS Lambda, Amazon (ACM), Amazon CloudFront + 9 more | Find emails |
| lge.com | #1,084 | Akamai edge/CDN, Akamai mPulse, Datadog + 5 more | Find emails |
| gofundme.com | #1,110 | Adobe Fonts (Typekit), Amazon (ACM), Amazon CloudFront + 22 more | Find emails |
| elsevier.com | #1,404 | Amazon CloudFront, Cloudflare Bot Management, Cloudflare edge/CDN + 8 more | Find emails |
| wpastra.com | #1,462 | AB Tasty, ActiveCampaign, AdRoll + 119 more | Find emails |
| eepurl.com | #1,513 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 10 more | Find emails |
| salesforceliveagent.com | #1,838 | Adobe Audience Manager, Akamai Bot Manager, Akamai edge/CDN + 12 more | Find emails |
| sky.com | #1,842 | Akamai Bot Manager, Akamai edge/CDN, Branch + 7 more | Find emails |
| clevelandclinic.org | #1,924 | Adobe Experience Cloud (Launch), Amazon CloudFront, Cloudflare + 9 more | Find emails |
| techtarget.com | #1,991 | Chartbeat, Cloudflare edge/CDN, DoubleClick (Google Ads) + 6 more | Find emails |
| asu.edu | #2,000 | AddToAny, Akamai Edge DNS, Cloudflare Web Analytics + 11 more | Find emails |
| ninjarmm.com | #2,302 | 6sense, Amazon Advertising, Amazon Route 53 + 19 more | Find emails |
| asana.com | #2,318 | Amazon Route 53, DoubleClick (Google Ads), Google Analytics + 8 more | Find emails |
| elastic.co | #2,377 | Amazon Route 53, Fastly, Google Analytics + 7 more | Find emails |
| lg.com | #2,446 | Akamai edge/CDN, Akamai mPulse, Datadog + 5 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 →