Free Chess Analysis ToolPowered by Stockfish 15+ NNUE

Yes! Our chess analysis tool is 100% free with absolutely no restrictions. You can analyze unlimited games with unlimited depth. No credit card required, no hidden fees, no premium tiers. We believe everyone should have access to high-quality chess analysis tools.

We use Stockfish 15+ with NNUE (Neural Network Updated Efficiently), which is the world's strongest open-source chess engine. It provides grandmaster-level analysis and is the same engine used by top chess platforms and professional players.

No registration is required! You can start analyzing your games immediately without creating an account. If you want to save your analyzed games for later review, you can optionally create a free account, but it's not necessary to use the core analysis features.

There are multiple ways to upload games: 1) Upload a PGN file directly, 2) Copy and paste PGN text, 3) Set up a position using FEN notation, or 4) Manually enter moves on the board. We support all standard chess notation formats.

Our analysis provides comprehensive insights including: move-by-move evaluation, best move suggestions, mistake classification (blunders, mistakes, inaccuracies), evaluation graphs showing position changes, alternative move variations, and detailed explanations for critical positions.

Absolutely! Our chess analyzer is fully optimized for mobile devices including smartphones and tablets. The interface adapts perfectly to smaller screens while maintaining all functionality. You can analyze games anywhere, anytime.

You can adjust the analysis depth from 10 to 25+ plies (half-moves) depending on your needs and device performance. Deeper analysis takes longer but provides more accurate evaluations, especially in complex positions. For most games, 18-20 plies is sufficient.

No, your privacy is our top priority. Games are analyzed locally in your browser using WebAssembly technology. Nothing is sent to our servers unless you explicitly choose to save a game to your account. You have complete control over your data.

Yes! You can export analyzed games in multiple formats: PGN with annotations and comments, PDF analysis report with diagrams and explanations, or share a link to the analyzed game. All export features are completely free.

Unlike Chess.com which limits free users to basic analysis and requires a premium subscription ($8-20/month) for deep analysis, we offer unlimited depth analysis completely free. No paywalls, no restrictions, no ads. You get the same powerful Stockfish engine without any limitations.

We use the same Stockfish 15+ NNUE engine as Lichess, so the analysis quality is identical. The main differences are in the user interface and presentation. We focus on providing a clean, intuitive interface with guided learning features to help you understand the analysis better.

Yes! While the engine provides grandmaster-level analysis, we present it in a beginner-friendly way. Each mistake is clearly explained, alternative moves are suggested with reasoning, and we provide context for why certain moves are better. It's perfect for players of all levels from beginner to expert.

Once the page is loaded, the Stockfish engine runs entirely in your browser, so you can analyze positions even with a slow internet connection. For full offline support, you can install our Progressive Web App (PWA) which allows complete offline functionality.

Yes! You can analyze games from any chess platform including Chess.com, Lichess, Chess24, ICC, or any other site. Simply export the game as PGN from the original platform and import it into our analyzer. We support all standard PGN formats.

Stockfish 15+ NNUE is rated over 3500 Elo, far stronger than any human player. The analysis is extremely accurate and reliable. However, remember that chess engines evaluate positions mathematically - they don't always consider practical human factors like psychology or time pressure.