Unique to Chessyi
See chess positions like never before
Most chess sites show an eval number. Chessyi paints the board, twelve heatmap overlays, per-piece attack and defense markers, and static position metrics on the same interactive board where Stockfish runs locally. Built for serious learners who want to understand why, not just what.
12+ visualization layers
Each overlay answers a different question. Toggle them in real time as you step through games or analyse your own positions.
Square control
Who dominates each square, white, black, or contested.
Mobility
How much freedom each side has to move pieces.
Both-side mobility
Combined mobility heatmap for sharp comparisons.
Attacks
Squares under direct attack, spot tactical tension instantly.
Defense
Protected squares and defensive resources.
Tension
Contested squares where pieces face off.
Danger zones
Areas where pieces are most vulnerable.
King safety
Shelter and exposure around each king.
Pawn structure
Weak squares, chains, and isolated pawns.
Piece activity
Active vs passive piece placement.
Center control
Fight for the critical central squares.
Static evaluation
Fast heuristics, material, space, and game phase without engine depth.
How visualization fits your study workflow
Heatmap overlays
Toggle between 12+ overlay types on the live board. Control, tension, mobility, king safety, and more, each answers a different question about the position.
Learn morePiece-level markers
Show attack and defense arrows per piece type. See which knight is dominating, which rook is passive, and how each unit contributes to the whole.
Learn moreStatic position analysis
Instant heuristics without waiting for engine depth, material balance, center control, pawn structure, and game phase at a glance.
Learn moreCombined with Stockfish
Visualization and engine analysis on the same board. Understand why Stockfish prefers a move by seeing the underlying square control and tension.
Learn moreWhy serious learners choose Chessyi
Only chess software with 12+ heatmaps on one board
Lichess and Chess.com show eval bars. Chessyi paints the position, control, tension, mobility, and king safety as colour overlays you toggle in real time.
Engine runs on your machine, not a queue
Local Stockfish executes locally in a Web Worker. No server wait, no depth caps on free tiers, and your opening prep stays private.
Study desk + training gym in one app
Load a Carlsen game, step through with heatmaps, drill the same opening line, then spar the engine, without switching tabs or tools.
1.9M master games included
No separate database subscription. 141 GM collections, famous classics, and repertoire PGNs ship with the software.
Experience deep visualization today
Open the board free, toggle heatmaps on any position in seconds.
Start for free