Following the discussion on the iOS version, the developer is open for an IPad version, since the current version is just for iPhone.

Personally, I bought the iPad just for study, so I use it much more than the iPhone. Also, my annotations, etc, almost everything done in the iPad.

I do not know how hard is to create a dedicated UI for iPad, but maybe, after all the efforts for the iOS, this can be seen as not so huge step as macOS to iOS.