# AFT Calculator vs SYSTEM JJ

The clearest difference is rating: SYSTEM JJ at 5.0 against AFT Calculator's 3.0. SYSTEM JJ also leads on in-app purchases (none vs 1) and update cadence (every 3 days vs every 3 weeks). On price, ratings volume, ads and iOS requirement there is nothing between them.

Both are free to download. AFT Calculator sells 1 one-off in-app purchase. SYSTEM JJ asks for nothing beyond the download.

SYSTEM JJ holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

AFT Calculator ships an update every 3 weeks, SYSTEM JJ every 3 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | AFT Calculator | SYSTEM JJ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/aft-calculator/id6746973298/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/system-jj/id6760544977/reviews)** |
| Number of ratings | 2 | 2 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Freemium | **Free** |
| Size | 16 MB | 194 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [阳 李](https://appshunter.io/developer/1809752863) | [Nicholas Hession-Kugelman](https://appshunter.io/developer/1884887934) |

## What reviewers say

### AFT Calculator

[App page](https://appshunter.io/ios/app/aft-calculator/id6746973298)

Instantly calculate Army Fitness Test (AFT) scores with this offline tool. It supports all five AFT events and provides pass/max score benchmarks. Upgrade to Pro for detailed breakdowns and progress tracking.

**Highlights:** Instant AFT score calculation, Supports 5 AFT events, Offline functionality, Private data handling, Pass and max score benchmarks, Event-by-event breakdown (Pro), Progress tracking (Pro)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime | $3.99 | one-time |


### SYSTEM JJ

[App page](https://appshunter.io/ios/app/system-jj/id6760544977)

This training companion helps you master jiu-jitsu by capturing session intentions and feedback. Record audio and video notes, utilize templates, and get AI coaching within the app.

**Highlights:** Capture training session intentions, Record audio notes, Record video notes, Utilize templates, AI coach integration

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

**In-app purchases:** none


## Frequently asked questions

### Is AFT Calculator free?

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

### Is SYSTEM JJ free?

SYSTEM JJ is free to download, with no in-app purchases.

### Which has better reviews, AFT Calculator or SYSTEM JJ?

SYSTEM JJ is rated higher. AFT Calculator averages 3.0 out of 5 from 2 ratings, while SYSTEM JJ averages 5.0 from 2 ratings.

### Do AFT Calculator or SYSTEM JJ have ads?

Neither AFT Calculator nor SYSTEM JJ shows ads.

### Which is updated more often, AFT Calculator or SYSTEM JJ?

AFT Calculator ships an update every 3 weeks, and SYSTEM JJ every 3 days. Most recently, AFT Calculator was updated on October 30, 2026 and SYSTEM JJ on November 5, 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.*