I only wish they had more books available
The app does exactly what it is meant to do: it lets you read chess books without moving the pieces yourself. This way the books consume less time and one may read them as a novel if one desires to do so. There are a few competitors on the market but this app simply has the best design. The only technical problem I’ve encountered is that there are less books in the app than on the website. I don’t know if it is a bug or not but you can simply add them on the website and then they will appear in the app.