VWO provides A/B, split and multivariate testing software.
https://visualwebsiteoptimizer.com
Analytics and Tracking · A/B Testing
Get access to data on 446,902 websites that are Visual Website Optimizer Customers. We know of 55,569 live websites using Visual Website Optimizer and an additional 391,333 sites that used Visual Website Optimizer historically and 31,275 websites in the United States.
Visual Website Optimizer websites that are also using other technologies.
Get a list of 446,902 websites using Visual Website Optimizer which includes location information, hosting data, contact details, 55,569 currently live websites and an additional 424,751 domains that redirect to sites in this list. 391,333 sites that used this technology previouslyand 31,275 websites in the United States currently using Visual Website Optimizer.
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These are sites that we think might use Visual Website Optimizer in the future because of their similarity to other sites that already do.