Underhook: BJJ & Jiu Jitsu

Underhook: BJJ & Jiu Jitsu

Grappling training & practice

6 ratings
6 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • July 22, 2026
  • October 3, 2026

Features

Underhook: BJJ & Jiu Jitsu video #1 for iPhone
Underhook: BJJ & Jiu Jitsu screenshot #2 for iPhone
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Underhook: BJJ & Jiu Jitsu screenshot #5 for iPhone
Underhook: BJJ & Jiu Jitsu screenshot #6 for iPhone
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Underhook: BJJ & Jiu Jitsu screenshot #8 for iPhone
Underhook: BJJ & Jiu Jitsu screenshot #9 for iPhone
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About

This app is a daily decision trainer for Brazilian Jiu-Jitsu practitioners. It offers structured lessons and practice scenarios to improve mat time retention and understanding of techniques. Designed for hobbyists, it aims to make training more effective through short, consistent practice sessions.

✓Guided path from white to blue belt
✓1,000+ scenario questions
✓Multiple learning formats (lessons, quizzes, chats)
✓Daily habit building with streaks
✓AI rival for realistic sparring
✓Available in English, Spanish, and Ukrainian
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What's New in Underhook

1.2.17

October 3, 2026

Your home screen keeps your streak, freezes, stamina and XP in one row, with the Roll button right there. After a fight you see when the next one comes. Your progress now shows only what you have earned. Reinstall the app and you land back on your path, gift included. Reminders no longer arrive at midnight or on days you already trained.

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Subscriptions & In-App Purchases

Underhook Pro Annual

All cycles, sparring, unlimited stamina

$49.991 Year
How to cancel Underhook subscription ⁉️

User reviews

BJJ people, this is for us!!!!

Finally something different from endless BJJ videos 😄 Love the way Underhook makes learning feel simple and organized. Great job!

Your Jiu-Jitsu Coach, Anytime

Love this app! It makes learning Jiu-Jitsu easy, fun, and really enjoyable.

Easy and fun learning

Started BJJ recently and this app is exactly what I needed. There’s so much to remember after class, and Underhook makes it much easier to understand and review techniques. Really enjoying it so far! 🥋

Very useful for beginner 100%

BJJ is not only about physicality, but about mental work as well. An average amount of training is enough to develop your physical abilities, but not enough to fully develop your mental game – obviously, unless you’re a professional who trains for several hours every day. But with Underhook, I can train my brain even while I’m waiting for an appointment to start. And oh boy, it’s beautiful and easy to use! 10/10.
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Dangerously addictive!

At first, I was skeptical - Duolingo for BJJ? But after a few days, it’s become a really handy tool for developing a “BJJ mindset.” Top-level work from the dev—the usability and attention to detail are just top-notch. Thank you for doing this!

Developer apps

FAQ

What is Underhook?

Underhook is a decision trainer for Brazilian Jiu-Jitsu that provides daily practice sessions to improve technique retention and understanding. It offers a structured path and various learning formats to supplement mat time.

Is Underhook free to use?

The entire path in Underhook, including all lessons and belt tests, is free. New users also receive a 14-day free trial of Underhook Pro, which offers unlimited stamina and access to the AI rival, Kat.

What are the subscription options for Underhook Pro?

Underhook Pro offers monthly ($7.99) and annual ($49.99) subscription plans, with a one-time lifetime purchase option also available. Prices are displayed before purchase within the app.

How does Underhook Pro compare to the free version?

Underhook Pro removes daily stamina limits, unlocks Kat the AI rival, and includes a second streak freeze. The free version provides access to the full learning path up to the blue belt test.

Can I cancel my Underhook Pro subscription?

Yes, subscriptions renew automatically but can be cancelled at least 24 hours before the current period ends. You can manage or cancel your subscription anytime in your Apple Account settings.

What devices does Underhook support?

Currently, Underhook is supported on iPhones. The app was last updated on August 3, 2026, with version 1.2.2.

What is the age rating for Underhook?

Underhook has an age rating of 4+, making it suitable for a wide range of users. The app focuses on adult hobbyists training Brazilian Jiu-Jitsu.

Does Underhook have ads?

No, Underhook does not contain advertisements. The app is free to use with optional in-app purchases for its Pro features.