I would use a chessboard but it is hard to set up a chess board on the couch or in bed, lol
sandbox app?
Here's probably what you are looking for:
https://play.google.com/store/apps/details?id=com.pereira.booknboard&hl=en
You might also be interested in an app called Forward Chess
As I'm reading books and studying the lines it would help if I had an app to visualize the position and best moves. Is there a way on chess.com or an app to manually place pieces in positions without replicating 30 lines if moves?