Statbrain.com offers their viewers an detailed look at a website's information, mostly on the number of visitors to a site. They estimate the number of visitors through the use of Alexa Rank and backlinks from websites. Yes, it is not a very accurate but it does give a very rough estimate. They use several online resource to get the estimated figure of visitors. Adevrtisers can make use of this information to gauge a site's potential. Statbrain also encourages user feedback and they use this information to fine-tune their service to improve on the accuracy. Their service is offered free of charge.