# Underhook - BJJ Practice App — Know your next move on the mat

> Brazilian Jiu-Jitsu decision trainer for daily practice and technique retention. (iPhone/iPad app by Oleksii Vasyliev.)

- Source: https://appshunter.io/ios/app/underhook-bjj-practice-app/id6760555653 (this page in markdown: same URL + `.md`)
- Developer: [Oleksii Vasyliev](https://appshunter.io/developer/1884446171)
- Category: Sports, Education
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 171 MB
- Languages: American English, European Spanish, Ukrainian
- Released: 2026-07-22
- Data updated: 2026-08-21
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/underhook-bjj-practice-app/id6760555653/reviews.md

## What is Underhook?

You train two or three times a week. The questions pile up faster than that: why did that sweep work, why do you keep getting caught in the same choke, what were you supposed to do from half guard? Underhook turns those questions into a 5-minute daily habit.

Underhook is a decision trainer for Brazilian Jiu-Jitsu, built the way the best learning apps are built: a structured path, short daily sessions, a streak worth protecting, and a rival who plays for real. Every question drops you into a real position and asks the only thing that matters on the mat: what do you do next?

THE PATH
• A guided path from day-one white belt to blue belt: survival, escapes, guard, passing, sweeps, submissions, and the strategy that connects them
• 1,000+ scenario questions built on 10 core mental models, so you learn principles you can apply from any position, not moves to memorize
• Lessons, quizzes, coach chats, podcast debates and voice lessons: 11 formats keep every session fresh
• Stripe tests along the way, one belt test at the summit. The path ends at blue belt. We mean it.

THE GYM
• Quick Roll: fast sparring quizzes against a gym roster of 12 rivals, from day-one rookie to black belt
• Kat, your AI rival: she plays to win, remembers exactly where your game broke last time, and targets that hole in the next fight (Pro)
• Stamina, streaks, XP and stripes keep the habit honest
• Fully available in English, Spanish and Ukrainian

BUILT FOR REAL TRAINING
Underhook is a supplement, not a substitute. It will not replace mat time and it will not promise you a belt. What it does is make your mat hours stick: 5 minutes a day so the questions you train on the mat actually make sense in class.

Made for adult hobbyists: new white belts drowning in information, blue belts stuck on a plateau, busy people who can't add a fourth class, and anyone sidelined by an injury who refuses to lose their game.

FREE AND PRO
The whole path is free: every lesson, every position, all the way to the belt test. Every new account also starts with 14 days of Underhook Pro, free, with no card and no auto-charge. Pro removes daily limits with unlimited stamina, unlocks Kat the Rival, and adds a second streak freeze. Monthly and annual plans and a one-time lifetime option are available in the app; prices are shown before you pay.

Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Payment is charged to your Apple Account at confirmation of purchase. Manage or cancel anytime in your Apple Account settings.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://underhook.xyz/privacy

See you on the mats. Oss.

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Underhook Pro Annual | $49.99 | per year |
| Underhook Pro Monthly | $7.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Underhook Pro Lifetime | $99.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/underhook-bjj-practice-app/id6760555653/reviews.md

### 5/5 — Very unique

*2026-07-29*

Love this for refreshing my memory of sequences and situations on the mat! Highly recommend this app👍

## Frequently asked questions about Underhook

### 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.

## Version history (last 5 releases)

### 1.2.6 — 2026-08-19

• 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.

### 1.2.5 — 2026-08-15

• Chat lessons now keep up with you: tap anytime to move the conversation forward, and the feed follows while you read at the bottom.
• The lesson summary shows more of your run: accuracy, remaining stamina, and progress toward your next stripe.
• A finished lesson is saved the moment it ends — even if you close the app from the summary screen.
• The audio pause button now actually pauses, and resumes right where you left off.
• Spanish: the academy group chats and DMs now speak Spanish, and every lesson level shows its Spanish title.

### 1.2.4 — 2026-08-09

• Sign in with Apple now keeps your progress: your streak, hearts and XP stay with you.
• Small fixes for smoother, more reliable training.

### 1.2.3 — 2026-08-08

• Ukrainian, rewritten. The first pass translated word by word; this one reads the way a coach talks. Every question, lesson, theory thread and screen — re-done from the English, not polished from the old text.
• Fixed: podcast episodes opened a blank screen and closed. Some voice memos played silent.
• New app icon.
• Small fixes: stripe counts read correctly in Ukrainian, positions and opponent names are localized, Delete Account moved out of the tap path.

### 1.2.2 — 2026-08-03

• Underhook now speaks Ukrainian: the full path, 1,300+ questions, coach chats and sparring decks — Українською.
• Smarter practice reminders: a morning nudge from the cast and an evening streak saver, never more than two a day.
• Small fixes and polish.

## More apps by Oleksii Vasyliev

- [DayLo: AI Mood Diary](https://appshunter.io/ios/app/daylo-ai-mood-diary/id6761025866)

All apps by Oleksii Vasyliev: https://appshunter.io/developer/1884446171

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*