Do you keep losing in the endgame? Making the same mistakes over and over?
Chess Diagnostics analyses your real chess games and shows you exactly
where you're losing points — so you train with purpose instead of solving
random puzzles.

── YOUR GAMES. YOUR WEAKNESSES. ──

Connect Lichess or Chess.com in seconds. The app automatically loads your
recent games and evaluates them with Stockfish — for free via Lichess
Cloud, no own server required.

── PRECISE WEAKNESS DETECTION ──

Chess Diagnostics identifies patterns across dozens of your games:

• Where do you make the most mistakes — opening, middlegame or endgame?
• Do you play worse under time pressure?
• Which tactics (forks, pins, skewers) do you regularly miss?
• How has your accuracy developed over recent weeks?

Blunders, mistakes and inaccuracies are evaluated per phase and displayed
clearly in one overview.

── TARGETED TRAINING ──

Based on your actual weaknesses, the app recommends matching Lichess
studies. No generic training — exactly what you need to improve. Work
through chapters directly in the app with an interactive chess board and
progress tracking.

── GAME REPLAY ──

Replay every game move by move. Mistake moves are colour-coded so you
immediately see where the decision went wrong.

── NO SUBSCRIPTION. ONE-TIME PURCHASE. ──

€2.99 once — no subscription trap, no hidden costs, no premium paywalls.
Buy once, use forever.

FEATURES AT A GLANCE

✓ Lichess login (OAuth2, secure)
✓ Chess.com integration (Public API)
✓ Stockfish analysis via Lichess Cloud
✓ Weakness analysis by game phase
✓ Tactical pattern recognition
✓ Personalised study recommendations
✓ Interactive chess board with mistake highlighting
✓ Weekly trend & accuracy history
✓ Offline mode with cache
✓ Dark mode
✓ German & English

TRY WITHOUT AN ACCOUNT

No Lichess account? No problem. Launch Demo Mode on the first screen and
explore every feature with sample data — free, no sign-up required.

Chess Diagnostics is built for club players and casual chess enthusiasts
who want to improve deliberately — without expensive coaching.