Very unique
Love this for refreshing my memory of sequences and situations on the mat! Highly recommend this app👍
Free
In-App Purchases
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
Show original description
What's New in Underhook
1.2.6
August 19, 2026
• The chat before a lesson no longer holds you up: the button works from the first line, and reads "Skip chat and roll" while the conversation is still typing. • Answers react the moment you tap. The buzz, the glow and the "Oss" land with your finger instead of a beat later. • The path map opens on your next lesson, and only that node pulses. • Buttons press down under your thumb. • A tighter lesson summary, plus profile and sparring cards in one visual language. • New here? Pro is unlocked for your first three days, right after onboarding.
MoreSubscription plans
Underhook Pro Annual
All cycles, sparring, unlimited stamina
$49.991 Year
1
In-App Purchases
$99.99
Underhook Pro Lifetime
One payment. Pro forever.
User reviews
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.