A free, lightweight C++ game engine with native scripting and hot reload
Free chess game analysis and personalized training built from your own games
Stage
Not given
Startup
Founded
Not given
2026
Based in
Not given
Not given
Pricing model
Free
Freemium
Pricing
Free to use with no fees, royalties, or revenue share. Full ownership of all created content.
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
Key features
Hot reload C++ scripting with state preservation
Visual editor with dockable, detachable panels
Prefabs with nested variants and live propagation
Physics system with multiple joint types
Audio mixer with effects and real-time processing
Asset import from glTF, FBX, and multiple formats
Standalone Windows x64 player with content cooking
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
What makes it different
Free and open-source with no royalties or revenue share
Perpetual license terms that cannot change after build distribution
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
Shalltear Engine
ChessVox