The problem of simple visitor statistic is you can't see WHY. Why visitors so quickly left a page? Why they don't buy this product or why they don't subscribe your newsletter. You can get answers if you see what they exactly do on the pages. Spy analytics is a simple tool that can record visitors' actions like scroll, mouse (eye) move and clicks. It's like in store. You can see how visitors follows products, on what they are paying attention.