first off, thank you for the online tool and the AN2866 whitepaper which is the clearest piece i read about the subject of nfc antenna design.
my issue with the online tool is the output is only in the form of a flash object.
to use it with my paper based nfc antennas i need to screen capture and do a bitmap tracing. it could be easier to export to an image or even better , to a vector format like SVG.
but if thats not in the scope a quick solution is to have an option to remove the nice rendering of the antenna and replace with 2 color b/w impression. currently the drop shadows hurt my conversion.