I’ve been thinking about the free period, and I haven’t yet decided when it will end. However, you don’t need an iPad to take advantage of it. You can go to the app store section of iTunes and download it now!
Tiny link: http://taii.cc/4o
Tai Shimizu is owner of Stormy Imaging and author of the iPad/iPhone photo editing App Filterstorm, the drawing app Inkist, and the Mac HDR app Light Compressor