Help & FAQ

Sign in to Chessiro with your email or Google account, then enter your Chess.com or Lichess username. Chessiro will automatically sync your recent games. You don't need to share your password — we only read public game data.

Yes. Game analysis with Stockfish 18 is completely free with no daily limit. AI Coach game reviews are available on Chessiro Pro, which also removes Replay Mistakes limits.

Chessiro works with both Chess.com and Lichess. You can also upload any PGN file to review games from other platforms or over-the-board tournaments.

Chessiro analyzes every move in your game using the Stockfish engine. Each move is classified as best, good, inaccuracy, mistake, or blunder. You get an accuracy percentage, an evaluation graph, and opening information — all without needing to install anything.

The AI Coach goes beyond engine evaluation. It explains why a move was a mistake in plain language, suggests what you should have been thinking about, and identifies patterns in your play. It's like having a chess teacher review your game with you.

Yes. Go to the Upload PGN page and paste your PGN text or upload a .pgn file. Chessiro will analyze it the same way it analyzes synced games from Chess.com or Lichess.

Chessiro uses Stockfish 18, one of the strongest chess engines in the world. Each position is analyzed at sufficient depth to provide accurate evaluations for club and intermediate players. The AI Coach explanations are powered by Google Gemini.

Yes. Chessiro gives you free chess game analysis with Stockfish 18, including move classifications, accuracy, evaluation graphs, and opening information. You can analyze synced Chess.com and Lichess games or upload a PGN.

Yes. Chessiro's AI Coach is designed to explain chess moves in plain language. It can describe the threat you missed, why the engine preferred another move, and what habit or pattern you should train next.

Yes. Chessiro supports online chess game review for Chess.com and Lichess. Connect your account or enter your username, then review your recent games with engine analysis and AI coaching.

Yes. If you have a PGN from an over-the-board game, club event, tournament, or another chess site, you can paste it into Chessiro's PGN analyzer and review the game move by move.

Chessiro helps you improve by turning your own games into a training loop: analyze the game, understand the mistakes, replay missed positions, and track recurring patterns. This makes your chess training more personal than random puzzles alone.

Yes. Chessiro combines Stockfish engine analysis with AI coaching. Stockfish finds the important moves and evaluations, while the AI Coach explains plans, tactics, mistakes, and improvement ideas in human language.

After game analysis, Chessiro identifies positions where you made a mistake and turns them into puzzles. You get to try again and find the stronger move. This is more effective than random puzzle training because you're practicing positions relevant to your actual games.

Chessiro turns your real games into personalized chess training. You review mistakes, practice the positions you missed, and get AI explanations that connect each move to a practical chess improvement plan.

The key difference is personalization. Replay Mistakes puzzles come from your own games, so you're working on your specific weaknesses rather than random tactics. The AI Coach can also explain the solution in the context of the game where the mistake happened.

Chessiro works for both. Beginners can use AI explanations to understand plans and tactics, while experienced players can focus on recurring mistakes, calculation gaps, and personalized chess improvement from their own games.

Go to the Pricing page or tap 'Upgrade' in your Profile. Chessiro Pro is billed monthly. You can cancel anytime from the billing portal.

Yes. Open your Profile, then tap 'Change' next to your connected account. Note that changing your account will reset your puzzle progress since puzzles are generated from your games.

Contact us at rakshit@chessiro.com and we'll delete your account and all associated data. If you have an active Pro subscription, cancel it first through the billing portal.

Yes. Chessiro is a Progressive Web App (PWA). On mobile, you can add it to your home screen for a native app-like experience with faster loading. On Android, you'll see an install prompt. On iOS, tap the Share button and select 'Add to Home Screen'.

Chessiro requires an internet connection for game syncing, analysis, and AI coaching. However, once a game analysis is loaded, you can browse through the moves without an active connection.

Chessiro works best in Chrome, Safari, Firefox, and Edge. For the best experience on mobile, we recommend using Safari on iOS or Chrome on Android.