Piet Jonas

This application lets you quickly chart data series just by entering the numbers (separated by comma or space). Features:- multiple charts- optionally …

Calculates the arithmetic mean, the geometric mean and the harmonic mean as well as the standard deviation and the confidence interval of a set of num …

Plot graphs of functions. Enter your formula and the range you want to plot.Features:- By separating the formulas with semicolons you can draw more th …

Test your knowledge and spot the states of the USA on the map. Choose the difficulty by the number of states to choose from.The wrongly guessed states …

Test your knowledge and name all state capitals of the USA. Adapt the difficulty with the number of capitals to choose from.The wrongly guessed capita …

Turn your iPad into a ruler and measure the scale of any small thing.Features:- switch between imperial and metric scales- adjust a line in the ruler …

This application adds the missing compass to the iPad. It either uses the built in magnetic compass (if available) or provides a sun compass (You just …

Retrieve the synonym for every word. If available you will get antonyms, related terms, similar word and user suggestions too. Tap one of the results …

Do you ask yourself sometimes, where in the world is this country? This application shows each country of the world on the map. Either select it from …

Create and manage all sorts of checklists. E.g. for travel, sports and things to do or to remember.Features:- Multiple checklists- check and uncheck t …