Nine-year-old Lim Ding Wen of Singapore has become one of the youngest iPhone developers, producing a application named Doodle Kids, according to Reuters. The painting program allows users to draw random shapes and sizes, in random colors, using a finger for input. Any creation can be saved as a screen capture or erased by shaking the iPhone or iPod touch. The app has already achieved over 4000 downloads from the App Store.

Lim mentions that he wrote the application for his three-year-old and five-year-old sisters who like to draw. He started using computer at the age of two, eventually developing fluency in six programming languages and completing roughly 20 programming projects.

His father, Lim Thye Chean, is the chief technology officer of a local firm and also writes iPhone applications. "Every evening we check the statistics emailed to us (by iTunes) to see who has more downloads," the father said.

Lim Ding currently is working on another iPhone application, a science fiction game titled Invader Wars.