The app can be read by the child, read by the narrator with you swiping between pages when you’re ready, or put on auto-pilot.
The reviews indicate that although the app contains no analytic, malware, or harmful delivery, it does have a prominent link to go spend $100 on other books so you might want to put it in airplane mode when handing over to a child.
How the Grinch Stole Christmas normally is priced at $4.99 on Amazon with the occasional Christmas time sale of $0.99, but you can grab it now whether or not you use the Amazon App Store and install it at such time as you need it or have a device you want to use it on.
[Amazon]