Chess Advisor

Chess Advisor finds what's costing you rating points.

Enter your Chess.com or Lichess username and Deep Review checks every game you've played with a chess engine, right on your phone. It shows the habits that lose you the most games, such as throwing won positions or missing pins, with an estimate of the Elo each one costs you and a drill to fix it. Your first insights are ready in about a minute. Nothing is uploaded and there are no ads.

DEEP REVIEW: YOUR WHOLE HISTORY
• What's holding you back: your biggest weaknesses, ranked by the rating points they cost you
• Tactical blind spots, accuracy by game phase, openings, endgames, time trouble and tilt, across all your games
• Puzzles built from your own mistakes
• Your openings: what you play most as White and Black, and how you score
• Runs on your device in the background; the first 20 games right away, the rest while charging
• AI Coach (optional): a plain-language report with a weekly training plan

REVIEW ANY GAME
• Move-by-move analysis powered by the open-source Caissa engine, running on your device
• Clear move classifications: Brilliant, Best, Excellent, Inaccuracy, Mistake, Blunder
• Paste a PGN, record an over-the-board game, scan a board photo, or open any imported game
• Tap a move or square in an explanation to see it drawn on the board
• Retry your mistakes: find the better move yourself before the answer is shown
• Self-review first: mark your own key moments, then compare with the engine
• Ask follow-up questions about a move (optional AI, grounded in the engine lines)

TRAIN
• My Repertoire: the openings you really play, where you leave theory or score poorly, drilled with spaced repetition
• Opening Academy with guided lessons for popular systems
• Endgame trainer: practise key endgames against perfect tablebase defence
• Puzzles from the Lichess puzzle database (CC0), plus puzzles built from your own mistakes
• Daily goals, streaks and optional reminders
• Home-screen widget with a daily mistake to solve

PLAY AND PREPARE
• Play the engine at adjustable strength, with an optional chess clock
• Prepare for an opponent from their public games, then rehearse against a bot that plays their openings
• Blindfold mode: play without seeing the pieces, by typing, tapping or speaking moves
• Over-the-board companion: record a game by voice or by tapping, with a tournament clock, read a scoresheet photo, and export the PGN or send it to Lichess
• Board scanning (optional AI): set up a position from a photo or screenshot

FOR EVERYONE
• In English, Spanish, Portuguese (Brazil), German, French, Russian, Hindi and Turkish
• Screen-reader support (TalkBack and VoiceOver), including the board
• Designed for phones and tablets
• Optional narration with natural English voices that run on your device (a one-time download)
• Backup and restore your games and progress to a file you control

YOUR DATA
• Your games and analysis stay on your device. No account needed.
• The AI features are off until you agree. They send only what each feature needs: an anonymized move summary, aggregate statistics, your question with the engine lines, or the photo you pick. Never your username or your game history.
• No ads. No paywall. Everything is free.
• Like it? Optional supporter subscriptions help keep it going and add a supporter badge and extra board themes; every feature stays free for everyone.

Chess Advisor is a study tool, not affiliated with or endorsed by Chess.com, Lichess, or the Caissa project. Caissa is free software under the MIT License; credits and source links are in Settings → About & licenses.