The input for geistware for wing span is for half span. You measure from the CL of the fuselage to the tip. Look at the picture to the right on the input screen that shows the airplane in planform. The "Y" measurement is shown clearly there. It goes from CL to tip for one side. So your input is for half-span.

From the dimensions input, they have enough information that both LE and TE sweep is considered. You've input the root chord and tip chord. The formulas only need one sweep measurement to know what the other sweep is without your having to provide it. The only shortfall of that software is when your planform is more complex than straight taper. It will deal perfectly with the dimensions you provide so long as you have a simple planform with all straight lines.