appstorealerts.com project was started on March 2013 and was put offline in November 2014. The project was done together with Roger Gros, and we used FuelPHP framework, MySQL and a bit of jQuery to develop it.
Basically, it was an alert system (through email) for the prices of the apps in the Apple AppStore. If the price of an app changes, you are alerted by mail. The concept was similar to steamalerts.com.
You can check two screenshots below: