Chartbeat

Chartbeat is an online analytics service that provide real-time data analytics and performance alerts for your website. Unlike Google Analytics that able to give you the information about the number of visitors during a certain period of time, Chartbeat informs the users’ real-time behaviour toward your website; whether they are still open the page or not, or whether they interact actively or not.

You can use this tool the same way you use Google Analytics; install the Chartbeat script at the bottom of your website page. Open this page to try one yourself.