Visitor.js lets any webmaster personalize his site, and have it turned into something that could appeal to almost all of the people who ever visit it. Visitor.js does that by retrieving information like the visitor’s location, his browser and his operating system. And Visitor.js can also figure out where each visitor you get is coming from. It can realize which keywords are bringing them in, and which other sites are referring them to yours.
All that information taken together lets Visitor.js personalize your site to the point that visitors can but stay around a little longer. And that little longer might just be what’s needed for them to buy any of your products, or to click on any of your ads.
VisitorJS.com In Their Own Words
Personalize your website to increase conversion rates.