Suggestions: Alignment, Margin, Orientation, and a book
Two suggestions, from the Kindle app.
Have books use justified alignment rather than left align. Makes it easier to follow the text and is a bit less jarring on the eyes. And since this is the way printed books align, it will help the iPhone app get a little closer to a book reading experience.
Also, add a little bit more margin around the text, giving a little more white space on the left and right.
Orientation. Amazon made me very happy when they added the ability to lock the orientation on the Kindle app. I do a *lot* of reading in bed with the Kindle app and like that the orientation does not shift every time I roll around. Would love to see a similar feature on Logos (and, for that matter, a lot of other iPhone apps, but I suppose Logos can't do anything about that!)
Finally, a book. Many books have been added to the iPhone, including many by John Piper. But I haven't seen Desiring God show up yet, and that's one I'm wanting to read via the Logos app. I assume Logos just hasn't yet received permission to include Desiring God? It just surprised me that a number of other Piper books are available but this one is not.