Theoria: Learn Chess Openings

Build, visualize, and master your opening repertoire. Theoria's interactive opening explorer is beautifully intuitive. See all of your knowledge in one place and watch it grow! FEATURES • Tree Graph - Map out your entire game plan and every variation. See the moves that make up your repertoire and add new lines with ease. • Training - Knowing theory doesn't matter if you can't recall it in a game. Our custom spaced repetition algorithm adapts to your understanding, so you build true mastery where it matters most. • Statistics - Prepare for what people actually play. See detailed stats about every move to stay ready for anything. • Engine - Cloud analysis & Stockfish on-device for optimizing your moves in any position. • Review - Analyze all of your online games, check for mistakes, and track your performance. Get real insights about the openings you play. YOUR REPERTOIRE, YOUR STYLE We don't tell you what to play. Import your online games and build on the openings you already enjoy, or start fresh with one of our expert-curated repertoires. Every choice is yours. LEVEL UP YOUR GAME Rating plateaued? This is the sign you've been waiting for - it's time to learn openings. Theoria makes it simple. FREE, FOREVER Theoria is proudly ad-free and free to use! Get started today!