I originally wrote the app for iOS over a year ago, but was unable to get it on the App Store. Apparently Warner Bros. has previously complained about Harry Potter related apps on the App Store, so to publish my app, Apple told me I needed to get signed documentation from W.B. saying that I had permission to use content from Harry Potter (even though my app uses nothing from the movies). After calling and emailing W.B. a number of times over the last year, I decided to give up and simply rewrite the app for Android.
A free version with fewer questions is in the works.