Chess Engines & Evaluation
The engines themselves — classical alpha-beta searchers, neural-network evaluators, and cloud platforms that run them at depths a laptop can't.
Almost every other tool on this site ultimately calls an engine. If you want to know what the objectively best move is, this is where the ground truth lives. Local engines are free and private; cloud engines are faster and deeper.
5 tools in this category
ChessBase
The professional desktop software for database work, deep analysis, and tournament preparation. Includes the Fritz engine.
Chessify
Cloud engine analysis in a browser. Run Stockfish at massive server speeds without installing anything.
Leela Chess Zero
Neural-network chess engine trained via self-play. Strategic, human-like play that often disagrees with Stockfish.
Lichess Analysis Board
Free, open-source, ad-free analysis with Stockfish in the browser and a serverless cloud engine for deeper dives.
Stockfish
The world's strongest open-source chess engine. Free, free forever, and powering most of the other tools on this list under the hood.