I am a true fan of MomsOnCall, But to be frank the app is just a watered-down version of their concepts and the book. If you already have the book like I did you definitely dont need the app. Unfortunately, the way they describe the app makes it seem like its going to be more individualized for your needs especially if you have more than one child at home who are different ages. If you pay the $3.99 you dont get the detail from the book so its really one or the other that I recommend.
Alyse Schwartz about Moms on Call