How not to blunder
This is different. Very unique and easy to navigate and learn. THIS is helpful and useful.👍🏾
Free
About
This app analyzes your chess games to identify recurring mistakes and weak habits. It then creates personalized training drills based on your actual blunders and missed tactics, helping you improve by focusing on patterns that cost you games. Analysis runs on-device for speed and privacy.
✓Personal game review with move-by-move feedback
✓Train from your own blunders and mistakes
✓Human-like insight with Maia and Stockfish
✓Real-time chess coach feedback
✓Recurring mistake tracking
✓Opening repertoire tracking
✓On-device Stockfish analysis
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What's New in Blunder Zero
1.8.6
September 14, 2026
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.
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FAQ
What is Blunder Zero?
Blunder Zero is a personal chess coach that analyzes your past games to identify recurring mistakes and weaknesses. It then uses this information to create personalized training drills focused on the patterns that cause you to lose.
How accurate is Blunder Zero's analysis?
Blunder Zero's accuracy scoring has been independently validated with a Pearson correlation of 0.978 against a widely used chess accuracy reference. Scores were within 3 points on 85% of games across 800 player-games.
Can I use Blunder Zero offline?
Yes, analysis runs on-device using Stockfish, making it fast, private, and available offline. You can review your games and train without an internet connection.
Does Blunder Zero have ads?
No, Blunder Zero does not contain advertisements. It is a completely ad-free experience for users.
What devices does Blunder Zero support?
Blunder Zero is available on iPhone, iPad, and iPod. It is designed for Apple mobile devices.
How does Blunder Zero compare to other chess apps?
Unlike many chess tools that show what went wrong in a single game, Blunder Zero identifies what consistently goes wrong across all your games and helps you fix those specific patterns through targeted practice.
What is the age rating for Blunder Zero?
Blunder Zero has an age rating of 4+. This indicates it is suitable for children and adults alike, with no mature content.
How often is Blunder Zero updated?
The latest version of Blunder Zero is 1.8.6, and it was last updated on September 14, 2026. Updates typically bring improvements and new features.