VWO provides A/B, split and multivariate testing software.
https://visualwebsiteoptimizer.com
Analytics and Tracking · A/B Testing
Get access to data on 449,690 websites that are Visual Website Optimizer Customers. We know of 46,486 live websites using Visual Website Optimizer and an additional 403,204 sites that used Visual Website Optimizer historically and 27,207 websites in the United States.
Visual Website Optimizer websites that are also using other technologies.
Get a list of 449,690 websites using Visual Website Optimizer which includes location information, hosting data, contact details, 46,486 currently live websites and an additional 250,804 domains that redirect to sites in this list. 403,204 sites that used this technology previously and 27,207 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.