Piet Jonas

Ruler App

Paid

Turn your iPhone or Apple Watch into a ruler and measure the scale of any small thing.Features:- switch between imperial and metric scales- adjust...

Compass

Paid

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

Grade Book HD

Paid

This application helps teachers to keep track of the grades, marks and credits of their different classes in school and university. It always shows...

Capital Quiz

Paid

Test your knowledge and name all state capitals of the USA.

3D Plotter

Paid

Plot graphs of 2-dimensional functions in 3D. Enter the formula for the function and the range you want to plot.Features:- toggle grid display-...

WorldWatchr

Free

Monitor updated Web images.

Compass for iPhone

Free

Find out which way is North with this compass application.

Sunrise & Sunset

Free

Get sunrise and sunset times for any place in the world.