From Victor Marian Busoi:
William Delbert Gann is known as the greatest market master of all times, with his portrait hanging at the entrance of the New York Stock Exchange. One of the most famous tools he used was the Square of Nine. It is said that he discovered it during his travels in India, where it was used by local traders who were selling goods. Today, it is being used by professional traders worldwide, in all markets: Forex, Commodities, Stocks, Indices, Futures, etc. It is a tool that Gann traders love to use and it's accuracy will amaze you. This app computes support and resistance levels for price, so that you don't have to do all the hard work. All you need to do is input the minimum tick size of the financial instrument you are trading (default is 0.0001, mostly for Forex instruments) and a pivot price, which is usually a recent significant high or low in price. After you have taken these two steps, the app automatically computes the price levels you need to watch out for. The bolded price levels are the strongest and most important ones, while the rest of them can be used for scalping or shorter intraday moves.
What's new in this version:
Fixed crash bug in iPad running iOS 3.2, where it crashed because of the iAds.