Analysis board, editor, calculators, and more — free forever on Aether.
Load any PGN or FEN, step moves, toggle engine lines.
Set up any position, copy FEN, jump to analysis.
Paste a FEN and get the engine best move in seconds.
Syzygy WDL / DTZ lookup on theoretical positions.
Photo-to-board, Chess.com, Lichess, or PGN into Game Review.
Paste a FEN, preview, jump to review.
Screenshot or diagram to FEN (on-device).
Estimate rating change after a win, draw, or loss.
Drill repertoire lines move-by-move.
Accuracy, Sigma→Clown grades, eval graph, critical timeline.