Build your openings.
Train them to mastery.
The focused workspace for competitive players to structure opening repertoires, drill targeted lines with spaced repetition, and track real improvement.
Everything a serious player needs.
Nothing they don't.
Structured preps
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.
Drill what matters
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.
Know where you stand
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.
Train like it's over the board
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.
Up and running in minutes.
Three steps from blank slate to game-ready repertoire.
Create a prep
Name your prep, choose your side — White or Black — and set the starting position for your opening.
Build your lines
Navigate the move tree and add the variations you want to memorize. Set your target depth and coverage goal.
Drill and improve
Study with spaced repetition. Mastery and coverage scores update in real time so you always know your next focus.
Simple, transparent pricing.
Start for free. Upgrade when your repertoire grows.
Enough to get started and see if it clicks.
- 2 preps
- 100 moves per prep
- Full study & tracking features
- No credit card required
Unlimited everything. No friction as your repertoire expands.
- Unlimited preps
- Unlimited moves per prep
- All features, forever
- Cancel anytime
Ready to level up your opening prep?
Join players who've replaced scattered notes and guesswork with a system that actually works.