Screen Compass

Screen Compass lets you to accurately measure the Radius, Circumference or Area of circular or polygonal shapes on your  screen.

The straightforward UI provides a swift control over the Compass alignment by letting you drag it with the mouse. Moreover, fine adjustments can be made using the keyboard hotkeys or nudge buttons.

The app is highly cutomizable, meaning that you can search for new skins and download them, and  also change the UI.

The Screen Compass comes with a technical skin allowing greater control and a crosshair for easy alignment. From aesthetic to technical you should find onscreen solution that suits your needs.

Even if the name of the app is Screen Compass, this doesn't means that the app can deal only wiht circular shapes. By going through the 'Shapes' menu you can choose to use a triangle, square, pentagon or any number of sided polygon up to the 39 sided Triacontakaienneagon.

The Units menu allows you to choose a new unit from the list of predefined units including pixels, inches and centimeters. You may also configure your own Custom Units using the 'Calibrate Units' menu option. Choosing this option will bring up a  screen which allows you to choose a Custom Unit, rename and set the scale.