Chess Opener Lite is a free iPhone app developed by Stanislav Basovnik, offering a comprehensive toolset for chess enthusiasts. The app boasts a Chess opening tree with game statistics and The Encyclopedia of Chess Openings (ECO) for in-depth exploration. Users can compare ECO and opening tree moves side by side, export chess openings in PGN format, and build their opening repertoire. Additionally, the app allows users to add or edit comments on moves, automatically classify sequences using the ECO system, and highlights moves already in the repertoire.

Chess Opener Lite also features an interactive trainer to memorize openings and variations efficiently. Users can train against random opponent moves, track progress, and customize the chessboard's appearance, including support for dark mode. The app works offline, providing a seamless experience for chess enthusiasts of all levels.