Versatile
Versatile app. Lots of different excersises. Altough it claims to be able to load in your own ebooks, this is not possible (anymore?). Maybe the newest ios13 prevents it. This is a bit of a bummer, as the default text seems to me pretty wierd. I like to read someting that makes more sense to me. But maybe its because I am not a native English speaker and the preloaded book is of (very) high literature level.