Blunder Zero : Chess Coach

On-device chess review

Free · Designed for iPad. Not verified for macOS.

Your games. Your mistakes. Your coach. On-device chess review with Stockfish 18. Stop losing the same way twice. BlunderZero is a personal chess coach built around your own games. It helps you review what happened, find the mistakes that keep coming back, and turn those positions into focused training. Instead of giving you endless random puzzles, BlunderZero studies your actual blunders, missed tactics, weak habits, and opening problems, then helps you practice the patterns that cost you games. Analysis runs on device with Stockfish, so review is fast, private, and available offline. WHY BLUNDERZERO? Most chess tools show what went wrong in one game. BlunderZero shows what keeps going wrong across your games, then helps you fix it. Review every move with clear explanations. Find recurring mistakes and weak habits. Train from positions you actually played. Build lasting improvement instead of chasing puzzle ratings. KEY FEATURES Personal Game Review Import your games and get a move-by-move breakdown with clear coach feedback. Train From Your Own Mistakes Convert your blunders, mistakes, and missed tactics into personalized training drills. Human-Like Insight with Maia See what players at your level would naturally consider, alongside Stockfish’s best move. Real-Time Chess Coach Get feedback while you play and learn to spot mistakes before they happen. Blunder Detection Identify the critical moments that changed the game and understand why they mattered. Recurring Mistake Tracking Discover patterns that appear across your games and focus your training where it matters most. Opening Repertoire Tracking See your most played openings, where you deviate, and which lines need attention. Master Games Lookup Compare your positions with stronger players and learn from real game examples. On-Device Stockfish Analysis Fast, private, offline-first analysis directly on your phone. Background Analysis Analyze multiple games while continuing to review and train. ACCURACY YOU CAN VERIFY We independently validated BlunderZero’s accuracy scoring across 800 player-games. The results showed a Pearson correlation of 0.978 against a widely used chess accuracy reference, with scores within 3 points on 85% of games. MADE FOR PLAYERS WHO WANT TO IMPROVE Whether you are a casual player, club player, or competitive online player, BlunderZero helps you: • Find recurring mistakes • Understand why they happen • Train from your own games • Build stronger habits • Stop repeating the same patterns HOW IT WORKS 1. Import a game or play inside the app 2. Review every move with coach feedback 3. Train the mistakes that matter most 4. Track your weaknesses as they improve Stop repeating the same mistakes. Start training on the games you actually play.

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Backup and Restore. You can now save your games, reviews and drill progress to a file, then bring everything back on a new device or after reinstalling. Find it in Settings, under Backup & Restore. Sharper analysis. Your games are always reviewed at full engine strength, so the coaching is as strong as the engine can make it, whatever opponent you played against. Clearer game review. Checkmate is recognized as the best move it is, and move classifications line up with what you would expect from a strong engine. Steadier sessions, with stability fixes across analysis and drills.

Version 1.8.6

The developer, SocialPlay AI, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • SocialPlay AI Limited
Size
  • 272.4 MB
Category
  • Sports
Compatibility
Requires iOS 13.0 or later.
  • iPhone
    Requires iOS 13.0 or later.
  • iPad
    Requires iPadOS 13.0 or later.
  • iPod touch
    Requires iOS 13.0 or later.
  • Mac
    Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
4+
Copyright
  • © 2026 SocialPlay AI
  • Developer Website
  • Privacy Policy

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