While technically you can download it on iPhone, the app works best in iPad (or MacOS if you have the later versions that allow device emulation for apps).
Please Read my latest blog post here
I am asking .99 for the app, mainly to avoid mass-downloads from bots, etc. since this is a pretty specialized application. If you have donated to me in the past, please send a message and I will send a redemption code for download. (Or if you would like to feature it on a video or blog of your own)