# IBJJF Rules vs Judokai

The clearest difference is in-app purchases: IBJJF Rules at none against Judokai's 10. IBJJF Rules also leads on review sentiment (89% vs 74%) and ratings volume (698 vs 191). Judokai's advantage is update cadence (every 3 weeks vs every 5 months). On price, rating, ads and device support there is nothing between them.

Both are free to download. Judokai sells 10 one-off in-app purchases. IBJJF Rules asks for nothing beyond the download.

IBJJF Rules holds the better App Store score, 4.8 against 4.7. Both are backed by a comparable volume of ratings — 698 and 191 respectively. Written reviews point the same way: 89% of IBJJF Rules's written reviews are positive against 74% of Judokai's.

IBJJF Rules ships an update every 5 months, Judokai every 3 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | IBJJF Rules | Judokai |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (698 ratings)](https://appshunter.io/ios/app/ibjjf-rules/id667446064/reviews)** | [4.7 (191 ratings)](https://appshunter.io/ios/app/judokai/id1493052354/reviews) |
| Number of ratings | **698** | 191 |
| Positive reviews | **89.3% of reviews** | 74.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 45 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [smudge.io PTY LTD](https://appshunter.io/developer/426335181) | [Eduardo Costa Producoes Audiovisuais LDA](https://appshunter.io/developer/1492684412) |

## What reviewers say

### IBJJF Rules

[App page](https://appshunter.io/ios/app/ibjjf-rules/id667446064)

Access a comprehensive guide to International Brazilian Jiu Jitsu Federation competition rules. Quickly find details on scoring, fouls, age and weight limits, and fight durations for referees, coaches, and athletes.

**Highlights:** IBJJF rules reference, Severe technical fouls, Points and scoring, Age limits, Weight classes, Fight durations

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and intuitive user interface
- 🚀 Quick reference guide for rules
- 📚 Comprehensive IBJJF ruleset information
- ⚡ Easy navigation and accessibility
- 🎯 Helpful for competitors, coaches, and referees

**What reviewers complain about**

- 📖 Insufficient detailed information
- 🔄 Outdated rule updates
- 🌐 Limited language options

**Reported bugs**

- App functionality issues (non-functional features)

**Requested features**

- Weight classes and divisions tab
- Portuguese language support
- Updated IBJJF 2020+ rules
- AJP (Asian Jiu-Jitsu Pro) rules inclusion


### Judokai

[App page](https://appshunter.io/ios/app/judokai/id1493052354)

Master Kodokan Judo techniques with detailed, slow-motion video demonstrations. Access all techniques anytime, anywhere, and download them for offline viewing. Learn from a 6th Dan Judo champion.

**Highlights:** Detailed Kodokan Judo techniques, 240 FPS slow-motion video, Offline video downloads, Learn from a 6th Dan champion, All Judo techniques accessible

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ma-sutemi-waza | $1.99 | one-time |
| Koshi-waza | $2.99 | one-time |
| Osaekomi-waza | $2.99 | one-time |
| Kansetsu-waza | $2.99 | one-time |
| Shime-waza | $3.99 | one-time |
| Yoko-sutemi-waza | $4.99 | one-time |
| Te-waza | $4.99 | one-time |
| Kodokan Goshin Jutsu | $4.99 | one-time |
| Ashi-waza | $6.99 | one-time |
| Judokai | $14.99 | one-time |

**What reviewers like**

- 👍 Excellent video quality and clarity
- 👍 Detailed demonstrations of techniques
- 👍 Great for learning and reference
- 👍 Easy to use and understand
- 👍 Good for exam preparation

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 App does not start after updates
- 🐛 Videos not loading or buffering
- 🐛 Low video clarity in some instances
- 🐛 Paid content not unlocking

**Reported bugs**

- App crashes after recent updates
- App does not open after updates
- Videos do not load
- App crashes on older iPhones/OS
- Paid content not unlocking

**Requested features**

- Add new kata forms
- Include Japanese term translations
- Add download all option for videos
- Synchronize favorites across devices
- Add notes and categorization for favorites


## Frequently asked questions

### Is IBJJF Rules free?

IBJJF Rules is free to download, with no in-app purchases.

### Is Judokai free?

Judokai is free to download, with in-app purchases available.

### Which has better reviews, IBJJF Rules or Judokai?

IBJJF Rules is rated higher. IBJJF Rules averages 4.8 out of 5 from 698 ratings, while Judokai averages 4.7 from 191 ratings.

### Do IBJJF Rules or Judokai have ads?

Neither IBJJF Rules nor Judokai shows ads.

### Which is updated more often, IBJJF Rules or Judokai?

IBJJF Rules ships an update every 5 months, and Judokai every 3 weeks. Most recently, IBJJF Rules was updated on November 6, 2026 and Judokai on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*