Chessly: Chess Puzzles

Completely offline and no logins required, Chessly trains your puzzle intuition. Curated puzzles designed to delight beginners to Grandmasters. The puzzles range from easy to fiendishly difficult. The minimalistic design lets the user go at the desired pace, while "Solved" and "Unsolved" filters let you review puzzles you've solved to ingrain them in your mind, or tackle the most problematic puzzles that you had trouble solving.