The focused workspace for competitive players to structure opening repertoires, drill targeted lines with spaced repetition, and track real improvement.

Define a start position, set your coverage target, and build lines move by move. Every prep is a dedicated workspace — no scattered notes or lost variations.
The study engine focuses on the lines you haven't mastered yet. Practice progressively so you never waste time reviewing moves you already know cold.
Two metrics at a glance: coverage shows how much of your target tree you've built, mastery tracks how well you've retained it. No more guessing if you're ready.
Group or merge compatible preps and drill your full Sicilian repertoire in a single session — mirroring the real variety you'll face in a game.
Three steps from blank slate to game-ready repertoire.
Name your prep, choose your side — White or Black — and set the starting position for your opening.
Navigate the move tree and add the variations you want to memorize. Set your target depth and coverage goal.
Study with spaced repetition. Mastery and coverage scores update in real time so you always know your next focus.
Start for free. Upgrade when your repertoire grows.
Enough to get started and see if it clicks.
Unlimited everything. No friction as your repertoire expands.
Join players who've replaced scattered notes and guesswork with a system that actually works.