Hi Phil
Interesting find. I'm downloading it now (after all my other apps 'update') but I note it requires a suitable 'adapter' to work with the polar finder scope. I'm using an HEQ5 pro and happen to have a neat little iphone steadypix jig from orion, that will work well I think for visual.
I might look at Alignmaster as well (
http://www.alignmaster.de/en_alignmaster.html).