Spy Tools for Kids is hoping to take advantage of the lucrative children's app market with a three dollar app that promises to keep kids entertained for ages. There is no age restriction on Apple's iOS devices, which is a good thing when you consider that the iPhone, iPad and iPod touch are possibly at their most popular amongst kids. Children of all age ranges are picking up iOS devices and having fun with them, almost guaranteeing a never ending supply of customers for Apple in the future.