Comparison

Brain vs BJJ Diary

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

Head to head
About

Brain

Features
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Brain-Jiu-Jitsu is a mobile application designed to help you manage your training in Brazilian Jiu-Jitsu by providing support tools to track your progress, analyze your performance, and reference skills and techniques in an intuitive Mind Map framework. Brazilian Jiu-Jitsu is a uniquely cerebral martial art that combines physical fitness and skill with intellectual challenges. Every opponent is a puzzle. Every roll is a test. Every detail matters. Brain-Jiu-Jitsu represents the cognitive aspect of the sport to help you train harder and smarter.

About

BJJ Diary

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BJJ Diary - Track every practice. Level up your Jiu-Jitsu. Journal Log what you trained right after practice. Write freely about techniques you learned, rolling reflections, and key insights. View your full history at a glance on the calendar. Notes Save technique tips, question lists, and anything you want to revisit anytime. Pin important notes for instant access. Drill List Manage "what you want to work on next practice" as a checklist. Add YouTube links to review techniques on the go. Competition Records Log your tournament results. Track division and open-class performance, and filter by belt color or category to review your history. Belt History Record every promotion and look back on how far you've come. Subscription BJJ Diary Plus Duration: Monthly, auto-renewing Price: $1.99/month (price may vary by region) Tag Management Organize journal entries and notes with tags. Filter by technique or goal to quickly find what you're looking for. Statistics Visualize your monthly training days, competition results, and category breakdowns in graphs. Consistency becomes confidence. Color Theme Customize the app's color palette to match your mood or the season. All data is stored locally on your device — no internet connection required. Record anytime, anywhere. Your subscription automatically renews unless canceled at least 24 hours before the end of the current period. You can cancel anytime in your App Store settings. Terms of Service (EULA): https://jet-cirrus-ba2.notion.site/Terms-of-Service-BJJ-Diary-363e1463890f80cd9642d7947785e1fb Privacy Policy: https://jet-cirrus-ba2.notion.site/Privacy-Policy-BJJ-Diary-363e1463890f809e9158f1972f4aecd4

Screenshots

Brain4 screens
BJJ Diary4 screens

Verdict

The call

The clearest difference is in-app purchases: Brain at none against BJJ Diary's 1. BJJ Diary's advantage is update cadence (every 9 days vs every 2 months). On price, ads, device support and iOS requirement 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. BJJ Diary sells 1 in-app purchase, starting at $1.99 per month. Brain asks for nothing beyond the download.

UpkeepUpdate frequency

Brain ships an update every 2 months, BJJ Diary every 9 days. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 4 level
Brain versus BJJ Diary: the parameters behind the verdict, then further details
ParameterBrainBJJ Diary
PriceFreeFree
Update frequencyEvery 2 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.615.1 — better
Further details — not scored
Size42 MB41 MB
Age rating4+4+
DeveloperKazuhiro MiyachiNorthfield Studio

In-app purchases

None

Brain

No in-app purchases

1 purchases

BJJ Diary

Subscriptions1
  • 柔術日記 Plus$1.991 Month

Questions

Is Brain free?
Brain is free to download, with no in-app purchases.
Is BJJ Diary free?
BJJ Diary is free to download, with in-app purchases available.
Do Brain or BJJ Diary have ads?
Neither Brain nor BJJ Diary shows ads.
Which is updated more often, Brain or BJJ Diary?
Brain ships an update every 2 months, and BJJ Diary every 9 days. Most recently, Brain was updated on October 30, 2026 and BJJ Diary on October 24, 2026.

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