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 |
|---|---|---|---|
| sonnenklar.tv | #56,563 | Let's Encrypt, Microsoft 365, Tealium + 1 more | Find emails |
| brightspeed.com | #56,670 | Bootstrap, ConsentMo, DigiCert + 13 more | Find emails |
| incapsula.com | #56,857 | 6sense, Bizible, DigiCert + 8 more | Find emails |
| #274 (Tranco) |
| Find emails |
| 5 | gitlab.com | #393 (Tranco) | Find emails |
| pinnaclesys.com |
| #56,914 |
| Amazon Route 53, Apache, Bootstrap + 7 more |
| Find emails |
| fourhourworkweek.com | #56,952 | Cloudflare, Google Fonts, Google Hosted Libraries + 6 more | Find emails |
| newrez.com | #57,014 | ASP.NET, Azure API Management, Bootstrap + 14 more | Find emails |
| enom.com | #57,230 | ASP.NET, Bootstrap, Google Fonts + 12 more | Find emails |
| adespresso.com | #57,325 | Cloudflare Bot Management, Cloudflare edge/CDN, FullStory + 14 more | Find emails |
| s-pankki.fi | #57,464 | Azure API Management, Microsoft 365, Sectigo + 4 more | Find emails |
| mdsol.com | #57,571 | Fastly, Google Analytics, Google Tag Manager + 12 more | Find emails |
| kaywa.com | #57,628 | Apache, Google Analytics, Let's Encrypt + 5 more | Find emails |
| lesschwab.com | #57,822 | Adobe Fonts (Typekit), Amazon Route 53, Azure Front Door + 8 more | Find emails |
| equinox.com | #58,072 | Adobe Audience Manager, Adobe Experience Cloud (Launch), Adobe Target + 9 more | Find emails |
| tinyletter.com | #58,347 | Akamai Bot Manager, Akamai Edge DNS, Akamai edge/CDN + 10 more | Find emails |
| foodtechconnect.com | #58,470 | Fastly, Google Analytics, Google Fonts + 5 more | Find emails |
| zoe.com | #58,538 | Cloudflare, DatoCMS, Google Tag Manager + 5 more | Find emails |
| aura.com | #58,575 | AWS Lambda, Amazon CloudFront, Amazon Route 53 + 10 more | Find emails |
| engie.be | #59,360 | Amazon Route 53, DigiCert, Drupal + 8 more | Find emails |
| postnord.com | #59,601 | Azure API Management, Cloudflare edge/CDN, Google Tag Manager + 4 more | Find emails |
| studio.co.uk | #59,669 | ASP.NET, Akamai Bot Manager, Akamai edge/CDN + 11 more | Find emails |
| srfax.com | #60,114 | Adobe Fonts (Typekit), Bootstrap, DigiCert + 14 more | Find emails |
| huntress.com | #60,527 | Amazon (ACM), Builder.io, Cloudflare + 3 more | Find emails |
| appriver.com | #60,705 | ASP.NET, Cloudflare, Google Tag Manager + 4 more | Find emails |
| tilebar.com | #60,825 | Cloudflare, Cloudflare edge/CDN, Google Fonts + 6 more | Find emails |
| banfield.com | #61,158 | ASP.NET, Azure API Management, Cloudflare + 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 →