chess.ceo

Whether you're a beginner learning openings or a tournament player preparing for your next opponent, Chess.ceo gives you professional chess analysis tools right on your phone.

Engine Analysis
Analyze any position with Stockfish, the world's strongest chess engine, running locally on your device, no internet required.

Need more power? Cloud Engines let you run analysis on a dedicated cloud machine, billed per minute and only while it's running.

14M Game Database
Explore over 14 million master-level games with real-time opening statistics. For any position, instantly see which moves were played, how often they led to wins, and at what rating level. Filter by rating range and time control to find data relevant to your level. Endgame positions are covered by seven-piece Syzygy tablebases showing perfect play with distance-to-mate.

Opponent Preparation
Search any player by name, country, or FIDE title. View their game history, ratings, and most-played openings. Study their repertoire and identify weaknesses before your next tournament game. Link players across FIDE, Lichess and Chess.com profiles.

Live Tournament Broadcasts
Follow ongoing tournaments with live game boards, per-board evaluation bars, and live standings. Jump straight into any player's games while a round is in progress.

Full Game Analysis
Import games via PGN, paste from clipboard or load from file. The engine evaluates every move and shows where mistakes were made. Build a complete variation tree with main lines and sidelines, annotate key moments, and save your analysis for later.

PGN Files
Organize your analyzed games into files and folders, synced across devices when you sign in. Import hundreds of games at once, or export to share with coaches and training partners.

Additional Features
• Chess960 (Fischer Random) with one tap
• Chess clock with customizable time controls
• Position editor for setting up any position
• Search games by position across your files
• Landscape and tablet support
• Seven languages: English, German, Spanish, French, Russian, Chinese, and Arabic

Free to Use
All of the above is free, no ads. Create an account and start analyzing.

CEO Tier: Optional Subscription
For players who want more:
• Pro Board: full-screen, distraction-free analysis
• Full database offline: all 10 million games on your device, no connection needed
• Higher daily limits on search, preparation, and database queries
• More storage for your PGN files

Subscribe monthly, cancel any time.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Terms of Service: https://chess.ceo/docs/tos
Privacy Policy: https://chess.ceo/docs/privacy