I would give this app a 4/5. I have had the paper binder and this app, and it does have the same amount of information as the binder. You can click of the diagrams and images to zoom in. You can click the tabs and see the sections listed, but you still have to "flip" through the sections to find what youre looking for. You can type notes in the sections.
Unfortunately, since Apple updated the iPhones to iOS 10, the app is no longer working properly. You open the tabs, but not the sections within the tabs. You also cannot retrieve any notes you entered. You need to update the app
LeoLeigh about Fast Facts for Critical Care, v2.6.3