Build your opening repertoire, drill every line with spaced repetition, and fix the mistakes you actually make in your real games.
The preps64 philosophy
01
Every candidate move is scored by real game results, engine evaluation, and master play. The strongest option is flagged as Recommended. The Focus Guide goes further: it finds the opening where your results are weakest and walks you step by step through building the right lines for it.
02
The study engine focuses on the lines you haven't mastered. No wasted repetitions on moves you already know cold. Only what you need to work on.
Left
11
Acc.
89%
Right
8
Wrong
1
03
Two metrics: 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.
04
Connect your Lichess or Chess.com account and preps64 automatically surfaces every opening deviation from your last games. Replay each mistake position until you find the correct prep move. No manual setup needed.
What players say
I went from blanking on the Sicilian after move 4 to knowing my lines 10 moves deep. The spaced repetition actually works.
10 moves deep
Finally a tool that treats opening prep seriously. I built my whole White repertoire in two weeks and I actually remember it.
The coverage and mastery metrics changed how I think about prep. I know exactly which lines I still need to drill.
Memorized my Caro-Kann in a single weekend.
The drill sessions are genuinely addictive.
I finally stopped getting crushed in the opening.
The coverage score keeps me honest about my prep.
Best five euros I spend every month.
My blitz rating jumped after just two weeks.
Clean, fast, no fluff. Just prep that sticks.
I review on my phone between games.
Recall feels effortless now.
Memorized my Caro-Kann in a single weekend.
The drill sessions are genuinely addictive.
I finally stopped getting crushed in the opening.
The coverage score keeps me honest about my prep.
Best five euros I spend every month.
My blitz rating jumped after just two weeks.
Clean, fast, no fluff. Just prep that sticks.
I review on my phone between games.
Recall feels effortless now.
How it works
Prep name
Pricing
Free
Enough to get started and see if it clicks.
Pro
Most popularUnlimited everything. No friction as your repertoire grows.
FAQ
Ready?
Join competitive players who replaced scattered notes and guesswork with a system that actually works.