VWO provides A/B, split and multivariate testing software.
https://visualwebsiteoptimizer.com
Analytics and Tracking · A/B Testing
Get access to data on 455,762 websites that are Visual Website Optimizer Customers. We know of 66,832 live websites using Visual Website Optimizer and an additional 388,930 sites that used Visual Website Optimizer historically and 35,056 websites in the United States.
Visual Website Optimizer websites that are also using other technologies.
Get a list of 455,762 websites using Visual Website Optimizer which includes location information, hosting data, contact details, 66,832 currently live websites and an additional 432,306 domains that redirect to sites in this list. 388,930 sites that used this technology previouslyand 35,056 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.