# Underhook: BJJ & Jiu Jitsu — Grappling training & practice > 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-and-jiu-jitsu/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 6 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 174 MB - Languages: American English, European Portuguese, European Spanish, Ukrainian - Released: 2026-07-22 - Data updated: 2026-10-04 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/underhook-bjj-and-jiu-jitsu/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, Portuguese, 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 3 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 (6 of 6) All indexed reviews: https://appshunter.io/ios/app/underhook-bjj-and-jiu-jitsu/id6760555653/reviews.md ### 5/5 — BJJ people, this is for us!!!! *2026-09-30* Finally something different from endless BJJ videos 😄 Love the way Underhook makes learning feel simple and organized. Great job! ### 5/5 — Your Jiu-Jitsu Coach, Anytime *2026-09-27* Love this app! It makes learning Jiu-Jitsu easy, fun, and really enjoyable. ### 5/5 — Easy and fun learning *2026-09-26* 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! 🥋 ### 5/5 — Very useful for beginner 100% *2026-09-25* 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. ### 5/5 — Dangerously addictive! *2026-08-22* 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! ### 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) ### 1.2.17 — 2026-10-03 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. ### 1.2.16 — 2026-09-30 Coach at a gym? After your second lesson, black and brown belts can give their students 30 days of Pro free. Your profile keeps the offer and a poster with a QR code for the gym wall. ### 1.2.15 — 2026-09-29 Pick your language right at the start. The app opens in your phone's language when we have it, and one tap switches it. Belt and stripe cards now press down when you tap them. ### 1.2.14 — 2026-09-27 Can't find your gym in the list? Add it yourself: name, city and country. It shows on your profile and your check-in card right away. The gym step is clearer: Skip is a real button now. The home screen is back to a clean start. ### 1.2.13 — 2026-09-26 Ran out of stamina? Your tank now comes back full 4 hours after it hits zero, and you still get one free refill a day. The screen shows exactly when you can train again. Home now shows your streak and your week at a glance. Fixes: if you're on Pro, you no longer see the "your Pro is up" screen by mistake. ## Apps similar to Underhook | App | Rating | Price | Category | | --- | --- | --- | --- | | [Grapplr: AI BJJ Coach](https://appshunter.io/ios/app/grapplr-ai-bjj-coach/id6752371493) | — | Free | Sports | | [Mat Mind - Jiu-Jitsu Planner](https://appshunter.io/ios/app/mat-mind-jiu-jitsu-planner/id6767997652) | 5.0 (3) | Free | Sports | | [TapFlow: BJJ Timer & Drills](https://appshunter.io/ios/app/tapflow-bjj-timer-and-drills/id6751439278) | 5.0 (1) | $9.99 | Sports | | [Altair Gym](https://appshunter.io/ios/app/altair-gym/id6738797742) | — | Free | Sports | | [InhibitProApp](https://appshunter.io/ios/app/inhibitproapp/id6464175192) | 5.0 (8) | Free | Sports | | [Brain-Jiu-Jitsu](https://appshunter.io/ios/app/brain-jiu-jitsu/id6477785304) | — | Free | Sports | ## More apps by Oleksii Vasyliev - [DayLo: AI Mood Diary](https://appshunter.io/ios/app/daylo-ai-mood-diary/id6761025866) - [Contacts to Excel – Export CSV](https://appshunter.io/ios/app/contacts-to-excel-export-csv/id6801859678) All apps by Oleksii Vasyliev: https://appshunter.io/developer/1884446171 ## Related topics [bjj](https://appshunter.io/ios/topics/bjj) --- *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 2026-10-04.*