Comparison

IBJJF Rules vs Judokai

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

IBJJF Rules

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
Read full description

This app provides a ready reference for referees, coaches and athletes involved in International Brazilian Jiu Jitsu Federation competitions. Details of IBJJF rules including severe technical fouls, points, age limits, weights and fight durations are provided. This app is not endorsed by or affiliated with the International Brazilian Jiu Jitsu Federation.

About

Judokai

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
Read full description

JUDOKAI — Your Kodokan Judo Reference Study the traditional techniques of Kodokan Judo through detailed, high-quality demonstrations. Explore Kata performed by respected Judo practitioners, study techniques from multiple angles, and keep your entire Judo reference library available wherever you train. EVERY KODOKAN TECHNIQUE Every traditional Kodokan Judo technique is demonstrated by César Nicola, 6th Dan, World Veterans Champion and National Judo Shiai & Kata Champion. Study the complete execution of each technique and replay it whenever you want to examine the movement, positioning and technical details. SEE THE TECHNIQUE FROM MULTIPLE ANGLES Carefully selected camera angles give you different perspectives of each technique, helping you observe the complete movement and focus on the details that matter. EXPLORE JUDO KATA Study dedicated Kata modules performed by respected Judo practitioners. Explore each Kata technique in detail and return to the demonstrations whenever you want to review and refine your understanding. STUDY OFFLINE Every Judo technique and Kata video can be saved for offline playback. Study at the dojo, at home, while traveling, or anywhere without an internet connection. BUILD YOUR PERSONAL REFERENCE • Bookmark techniques for quick access • Save techniques for offline playback • Revisit your favorite techniques whenever you need • Keep your Judo reference with you wherever you train FOR JUDOKAS WHO WANT TO STUDY THE DETAILS Whether you're learning a technique, reviewing what you practiced at the dojo, studying for a grading, working on Kata, or simply looking for a reliable technical reference, JUDOKAI puts traditional Kodokan Judo at your fingertips. JUDOKAI isn't a replacement for the dojo. It's the technical reference you can use alongside your training to watch, review and study Judo techniques in greater detail. Study the technique. Review the details. Strive for perfection.

Screenshots

IBJJF Rules4 screens
Judokai4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
IBJJF Rules versus Judokai: the parameters behind the verdict, then further details
ParameterIBJJF RulesJudokai
PriceFreeFree
Rating4.8 (698 ratings) — better4.7 (191 ratings)
Positive reviews89.3% of reviews — better74.4% of reviews
Number of ratings698 — better191
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size4 MB45 MB
Age rating4+4+
Developersmudge.io PTY LTDEduardo Costa Producoes Audiovisuais LDA

Customer experience

IBJJF Rules

All ratings693 ratings
Positive96.1%
Neutral2.5%
Negative1.4%
Written reviews28 reviews
Positive89.3%
Neutral7.1%
Negative3.6%

Judokai

All ratings191 ratings
Positive92.7%
Neutral2.6%
Negative4.7%
Written reviews39 reviews
Positive74.4%
Neutral7.7%
Negative17.9%

User reviews

IBJJF Rules

From 698 App Store ratings

What we love

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

Room to improve

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

Judokai

From 191 App Store ratings

What we love

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

Room to improve

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

Bugs and requests

IBJJF Rules

Reported bugs

1 issue
  • App functionality issues (non-functional features)

Requested features

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

Judokai

Reported bugs

6 issues
  • 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
Show 1 more
  • Seoi-nage and Ippon seoi nage use the same video

Requested features

8 requests
  • Add new kata forms
  • Include Japanese term translations
  • Add download all option for videos
  • Synchronize favorites across devices
  • Add notes and categorization for favorites
Show 3 more
  • Add combinations or more Ne-Waza
  • Add pins, chokes, and locks
  • Allow creation of self-named categories for sorting

In-app purchases

None

IBJJF Rules

No in-app purchases

10 purchases

Judokai

One-time10
  • Ma-sutemi-waza$1.99
  • Koshi-waza$2.99
  • Osaekomi-waza$2.99
Show 7 more
  • Kansetsu-waza$2.99
  • Shime-waza$3.99
  • Yoko-sutemi-waza$4.99
  • Te-waza$4.99
  • Kodokan Goshin Jutsu$4.99
  • Ashi-waza$6.99
  • Judokai$14.99

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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