Chesso

Chesso is a chess app that lets you add visualisation layers over the board. It's aimed at beginners and intermediate players for studying purposes.

Chesso does not come with a chess engine integrated, nor does it support multiplayer, but you can import games from other apps in a PGN format. Its sole purpose is to help visualise certain aspects of the game.

The app is meant for studying purposes only. Never use it to gain any unfair advantage in a real game.