This is a fantastic app! I have the Bob Books in paperback but couldnt get my five year old to really engage. He LOVES the digital version and happily gets to work. I used this app all summer and watched his comprehension growing in leaps and bounds every day. As a former elementary school teacher and now a parent of a Kindergartener, I am so thrilled to find this app. Please keep the series coming...Cant wait to buy the whole set!