Three chess apps by one author. Each has its own privacy policy, because each handles a different amount of your data — and two of them handle almost none.
A chess coaching platform: a live lesson with a shared board and voice, homework, progress tracking and a report for the parent. An app for the work of a chess trainer.
Chess puzzles that train calculation and pattern recognition, on your own and at your own pace. Published on Google Play.
Practice holding the board in your head: moves without a board, from a single square to a whole game.
Contact and support — one address for all three apps.