Theoria vs Chessbook

Chessbook and Theoria both help you build and drill an opening repertoire. Theoria goes further: it builds your repertoire from your own games, shows it as one interactive tree, and gives you three times as much room for free.

At a glance

Chessbook’s free plan is from chessbook.com and its prices from its App Store listing, both checked November 2026.

Why players choose Theoria

• Start from the games you’ve already played. Enter your Lichess or Chess.com username and Theoria builds a repertoire from the moves you play most, with the common replies covered, and sets each move’s starting mastery by how consistently you play it. See what it finds in your games.
• See your whole repertoire at once. Every position is a dot on one tree, each ring a move deeper, so gaps and overgrown branches stand out at a glance.
• Three times the room, free. 600 positions across two repertoires, typically one for White and one for Black, without ads.
• Pay less when you go Pro, or pay once. Theoria Pro is $5.99 a month or $59.99 a year, and it’s also available for life.
• More than openings. Endgame lessons, daily quests and streaks keep your training going.