Captain Duck by Harper Collins is one book in a series of books involving Duck. My daughter loved the story and liked the app. She was immediately entranced by the voice and the story:
She had a bit of a hard time figuring out the navigation, but she is 3 and the swipe is somewhat new to her. This was quickly overcome in a matter of days.
I give the app an attention of 4, Fun of 4 and learning of 3.
That is pretty good! Check it out here:
http://itunes.apple.com/gb/app/captain-duck-by-jez-alborough/id376171463?mt=8