Chessis turns every game you play into a chess lesson. Analyze your games with Stockfish 18, see exactly where the game turned, understand WHY a move was a mistake — and replay your mistakes until you find the right move.

Trusted by over 1,000,000 chess players.

♟️ GAME REVIEW LIKE A COACH
✔️ Full game report with accuracy, estimated rating, and phase-by-phase breakdown
✔️ Key moments: the turning points that decided your game, explained in plain words
✔️ Move badges from Brilliant to Blunder — and "Why Blunder?" shows the idea you missed, right on the board
✔️ Retry Mistakes: replay the critical moments of any game and find the better move this time
✔️ Analyze your Chess.com and Lichess games, import PGN files, or scan a board with your camera

🤖 PLAY HUMAN-LIKE BOTS
✔️ Bots with human playing styles — aggressive, defensive, natural — at every level
✔️ Blunder alerts while you play: learn before you lose
✔️ Hints, takebacks, and move-strength feedback
✔️ Play casually or on the clock

📚 LEARN OPENINGS & TRAPS
✔️ Explore all chess openings with names and main lines
✔️ Trap training: practice famous opening traps until they stick

🛠 POWERFUL ANALYSIS TOOLS
✔️ Stockfish 18 — the strongest chess engine in the world
✔️ Multiple engine lines, threat arrows, and blunder detection
✔️ Board editor with live evaluation bar
✔️ Games database with FEN search and annotated PGN export
✔️ Chess960 (Fischer Random) support
✔️ Engine vs Engine matches — watch engines battle
✔️ Works with Chessnut electronic boards

🎨 Beautiful board themes and pieces · 🌍 14 languages · ☁️ Google Drive backup

Most features are free. Chessis Pro supports development and adds:
✔️ Unlimited game analysis
✔️ Deep analysis with higher depth and NNUE
✔️ Unlimited engine lines and playable engine lines
✔️ Mistake alerts and move strength while playing
✔️ "Why Blunder" lines
✔️ No ads

Questions or suggestions? Email us at chessimprovementapps@gmail.com — we read everything.

Let's analyze chess with Chessis!