Free chess game analysis and personalized training built from your own games
Native ARM64 game porting for Mac and iPhone
Stage
Startup
Not given
Founded
2026
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Based in
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Pricing model
Freemium
Open source
Pricing
Free plan includes game reviews (150 per day limit), puzzle practice, Blunder Preventer, one free session weekly of each premium trainer, 2 repertoires up to 10 lines each, and one scouting report monthly. Premium costs $2 per month, $12 every 6 months, or $20 per year, unlocking unlimited access to
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Key features
Move-by-move Stockfish analysis of Chess.com and Lichess games
Blunder Preventer trainer to spot tactical mistakes
Opening Improver with opening encyclopedia and repertoire trainer
Time Trainer for practicing under time pressure
Visualization module for calculating forcing lines
Resourcefulness training for difficult positions
Scouting report showing skill breakdown and training recommendations
Analysis board with Stockfish 19 running in browser
Daily chess puzzles
Game code rewriting during build
Metal graphics backend
Game compatibility records for 211+ titles
Device checker tool
Setup planner tool
Graphics configuration tool
Issue report builder
Graphical launcher for Mac and Windows
AI assistant integration with launcher
Shared app library for multiple games
What makes it different
Personalized training built specifically from patterns in your own games rather than generic material
Recurring mistake detection that turns common errors into focused training modules
Free game analysis without sign-up for casual users
Integration with Chess.com and Lichess accounts for automatic game import
Affordable premium pricing starting at $2 per month
Native code execution instead of emulation for better performance
Comprehensive setup guides and troubleshooting tools
ChessVox
S2Arm