A chess analysis app for iPhone, iPad and Mac

Point the camera at a screen, pick a screenshot or photograph a diagram in a book. ChessWOW finds the board, places the pieces and asks you to confirm whose move it is. Squares the recognition is unsure about are marked, and you fix any piece with a tap. Recognition runs on the device; the image is not uploaded.

• Analyze a chess screenshot: screenshots, copied images, positions from videos and puzzle apps.
• Scan a chess book diagram: books, magazines, printed puzzles and PDFs.
• Chess board editor: set up a position by hand or paste a FEN when there is no picture.

Once a position is on the board, Stockfish 19 starts calculating. You see an evaluation bar, the best move as an arrow and up to three candidate lines. Move a piece and the engine recalculates the new position. The guide on the offline Stockfish app explains how to read the numbers, what "+1.2" means and why depth matters.

Import your recent games from Chess.com or Lichess by username, or open any PGN file. For each game ChessWOW builds a report: accuracy for both sides, a graph of the evaluation over the game and the critical moments described in plain words. You can replay each critical moment and try to find the better move yourself.

• Analyze Chess.com and Lichess games
• Chess game review: accuracy and mistakes explained
• Estimate your chess rating from imported Lichess games, shown as a range.

Play Stockfish at five levels, from a beginner setting that makes deliberate mistakes up to full strength. Hints, takebacks and a blunder warning help while you learn, and you can switch the warning off when you want a real test. Two people can play on one iPhone, iPad or Mac with a chess clock, and the app turns the pieces and clock for the player across the table. Endgame tablebases let Stockfish play and judge positions with few pieces exactly.

• Play against Stockfish
• Two-player chess on one device
• Endgame tablebase