KurobiApp Store

stop training blind

The BJJ training app that helps you know what to drill next.

Kurobi connects your training log to a 3D map of Brazilian Jiu-Jitsu. Record what happened on the mats, see where your game gets stuck, and give your next session a clear focus.

Download on the App StoreAndroid coming soon — join the waitlist

700+ 3D positions. 1,400+ animated transitions.

Remember what happened. Understand what needs work.

You leave class with a new technique, a few good rounds, and something you couldn’t make work. By the next session, the details start to fade. Keep those details in Kurobi so you can return to the moves, mistakes, and questions that deserve another look.

Training Log

Keep a BJJ training log you can learn from.

Record the techniques you drilled, attempted in rolling, or used in competition. Track your moves and your opponent’s responses, including what worked and what didn’t. Return to your training history when you’re deciding what to practice.

Technique Map

See how your techniques connect.

Explore a BJJ technique map of connected positions and animated transitions. Follow a guard pass into the position it creates, then explore your options from there.

Understand where a move starts, where it takes you, and how it fits into a longer sequence.

Game Plan

Build your BJJ game plan around the moves you use.

Discover the technique chains that recur in your training. See how your preferred positions and transitions fit together, recognize missing connections, and develop an A-game with options beyond your first attack.

Next Session

Find a focus for your next session.

Review moves that keep failing, positions where you get stuck, and opponent attacks you haven’t answered. Compare what you drill with what you use in rolling, and revisit techniques you haven’t practiced lately.

Choose something specific to work on when you return to the mats.

Train. Log. Review. Repeat.

  1. Capture the session.

    Record the techniques and moments you want to remember.

  2. Look for patterns.

    Review what worked, what stopped you, and how your techniques connect.

  3. Take a focus back to training.

    Choose a move, position, or transition to revisit. Log what happens next.

Kurobi at a glance

What it is
A Brazilian Jiu-Jitsu training app that connects your training log to a 3D map of positions and transitions, so you can see where your game gets stuck and choose what to drill next.
Platform
iPhone, on the App Store (iOS 16.4 or later). Android is coming soon.
Price
Free to download. Using Kurobi after onboarding requires Kurobi Pro, a monthly or yearly App Store subscription. Eligible new subscribers can start with a 14-day free trial.
Technique library
A curated map of 700+ positions and 1,400+ animated 3D transitions.
What you log
Drills, rolls and competitions: positions, transitions, outcomes, problems, notes, reps or duration, and your perspective in each exchange.
Offline
Logging and the technique map work offline. Your data syncs when you reconnect.
Who it’s for
BJJ students of any belt level, aged 13 and over.
Account
Sign in with Apple.
Developer
Mark Isayan

Questions before you start

Kurobi connects your training entries to positions and transitions on a technique map. Alongside remembering a session, you can explore related moves, recognize recurring sequences, and review gaps in your game.

Give your next round a clear focus.

Keep what you learned. Understand where you got stuck. Choose what to work on next.

Download on the App StoreAndroid coming soon — join the waitlist

Coming soon

android is on the way

Join the waitlist and we’ll tell you the moment Kurobi lands on Google Play. One email, no nagging.

Launch updates only. See our Privacy Policy.