RulerSwift

This may be the easiest screen measuring tool in Mac OS X :-).
It is really easy to use and you have four different kinds tools to choose.
You can easily get some value information you want with it.
You can easily measure the length between two different spots (in centimeter, inch and pixel).
You can easily measure the angle in the screen(in degree and Radian).
You can easily move or rotate the panel with your mouse.
I hope you like this app, thank you.