Its great to have the RTK kanji list. But other than that, theres not much else. Theres NO substitute for physically writing kanji to aid retention and penmanship, using an app as a shortcut hurts your learning. And the app is pretty much crippled till you pay up. Not going to use ios keyboard for entering stories. Kudos for the effort - but no thanks. Itd be far more useful to have a searchable kanji dictionary (by stroke, radical, on/kun) by my side while I practice on paper.
JSH:RxM about Kanji Stories