Development and sale of programs for iPhone and iPad is becoming more and more relevant every day. There are many reasons for this: this is more than 30 million devices with iPhone OS worldwide (which means the same number of potential buyers of applications based on it), and a convenient revolutionary interface, and excellent gaming capabilities (gravity sensors, Multi-Touch technology), and powerful application development tools. Apple actively promotes the use of its developments in third-party programs, which significantly improves the quality of end products.