Free forever · no daily cap
Game Review, unlimited
The big site caps you at one shallow review per day and charges $119/year for more. This one is free forever: type your chess.com username (no password — archives are public), pick a game, and a real Stockfish engine analyzes every move in your browser. Also free here: play chess live · MOGUL.
Why this is free when theirs isn't
Game review is expensive when a server farm does the analyzing — that's what the subscription pays for. But your games are already public on chess.com's open API, and Stockfish runs beautifully in a modern browser. So the whole review — fetching, engine evaluation, accuracy math — happens on your device. Our cost is zero, so your cost is zero. Review one game or a hundred.
What the labels mean
Best — you played the engine's move. Inaccuracy (?!) — gave up around half a pawn of advantage. Mistake (?) — a pawn or more. Blunder (??) — 2.5+ pawns, usually hanging a piece or missing a tactic. Accuracy uses the published lichess win-percentage formula, so scores are comparable to what you're used to. Click any move — or the eval graph — to jump the board there; on errors you'll see the green arrow for what the engine preferred.