Grizzledbaer,
In my opinion, the GL app is pretty much the same between Apple and Android as far as features and content. The biggest difference is in how you do things (Appley or Adroidish). I made training videos for Android, with an intro blog post here:
http://www.lizmcguireonline.com/index.p ... y-training
...if you go a little more than half way down, to the section titled "Gospel Library Content and Features", it describes each of the videos - with the title being a link to the article - with video embedded. The descriptions alone at the above link may well be enough to tell you what you want to know - a listing of what features exist. And one video would give you a look at the user interface (though I'm not sure how / if the Amazon Fire might tweak the GUI). I based my videos off some Apple videos (linked in that article) done by an institute or seminary teacher (which is why I say they're comparable as far as feature set). Since I don't have / use iOS, I'm not familiar enough to rattle off a list of differences, but the link above might get you what you want to know - or prompt specific questions.
Liz