Chessigma

Chess players who want to review their games face strict limits on major platforms: Chess.com gives free users only one game analysis per day and requires a Diamond membership for full engine review. This leaves players unable to study most of their games in depth, locked out of move-by-move grading, accuracy scores, and best-move suggestions unless they pay. Players who want to find weaknesses across their full game history, drill specific openings, or get single-position engine checks have had to rely on paid tools or piece together free resources.

Chessigma lets users enter a Chess.com or Lichess username, or upload a PGN file, to get a full game analysis report running on Stockfish, entirely on their own device and without a daily limit or signup requirement. Every move is graded from Brilliant to Blunder based on how much it changed the player's winning chances, with an overall accuracy score, automatic opening identification, an evaluation graph showing turning points, and the engine's top choice for every position. Users can step through games on an analysis board, toggle engine lines, explore missed variations, and drill specific opening lines in a dedicated opening trainer when a game reveals a repertoire gap. The site also offers puzzles, a blunder trainer, bot sparring, an Elo calculator, a board editor, and an early-stage AI chess coach product called Supercoach, along with a next-move tool that returns the Stockfish best move from any FEN.