The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Jens Groenager:
You can see the development of the most common forms of growth by writing your own numbers in the citation marks . Each of your own problems are saved for you to leaf through swiping. Try putting 1%= 0.01 for the interest of the last screenshot to see that you should not pay back 2.3 times.The app translates your choise of model and numbers to one of the usual mathematical formulas. It also graphs the result for the span of numbers you specify bottom right.Examples of models are weigth loss when dieting a number of days, The expected ice or snow cover in any future year, car power required to go your choise of speed and the loan repayment above.You can enter own text and numbers for a chosen model or paste a text received by mail or from the net. The resulting math translation can be pasted into a math program of the dialect you have chosen in preferences. The natural language translated from can also be chosen in prefs, fx danish.