Built for chess players who want to improve
Chessyi is not another place to play blitz. It is a complete study lab: analyse with Stockfish on your device, drill openings, explore 1,917,619 master games, and see positions through heatmaps and piece-level overlays that make patterns click.
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Who Chessyi is for
Club players (1200-1800)
Review your tournament games with Stockfish, drill openings you actually play, and spar vs computer at your level. Heatmaps help you see why positions feel uncomfortable before the engine proves it.
Dedicated improvers (1800-2200)
Deep-dive master games in your systems from the 1.9M library. Compare your lines to Carlsen, Nakamura, or historical champions. Multi-PV engine analysis and piece-level overlays accelerate pattern recognition.
Coaches and parents
Demonstrate ideas on an interactive board with visual overlays students understand. Load famous games, step through moves, and toggle heatmaps to explain control and tension without a classroom engine setup.
Chess enthusiasts
Explore 141 GM databases, replay classics, and experiment with 10 SVG piece sets and board themes. No install, open chessyi.com and start exploring.
Tournament players
Prepare openings privately with a local engine. Save critical positions to your cloud account, review between rounds on mobile, and run timed sparring sessions before your next game.
What makes Chessyi unique
Analysis runs on your machine
Local Stockfish in your browser, fast, private, no server queue for your opening prep.
Visual tools others do not bundle
12+ heatmap overlays and per-piece attack markers on the same board as the engine.
1.9 million games included
141 GM databases and 166 opening collections, no separate subscription.
One workflow from game to lesson
Play vs computer, import PGN, drill openings, and analyse, same board, same tools.
Ready to analyse like a master?
Open the board free, Stockfish, openings, and 1.9M games in one place.
Start for free