# SGS G21 vs KFA 챌린지

The clearest difference is update cadence: SGS G21 at every 3 days against KFA 챌린지's fortnightly. KFA 챌린지's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SGS G21 ships an update every 3 days, KFA 챌린지 fortnightly. The most recent releases landed on September 17, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | SGS G21 | KFA 챌린지 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 64 MB | 71 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [SA21C co., Ltd.](https://appshunter.io/developer/1380778684) | [WePlayRight Co., Ltd.](https://appshunter.io/developer/1484254607) |

## What reviewers say

### SGS G21

[App page](https://appshunter.io/ios/app/sgs-g21/id1471088550)

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

**In-app purchases:** none


### KFA 챌린지

[App page](https://appshunter.io/ios/app/kfa/id6443858415)

Manage your child's soccer progress and records. Register children using bracelet recognition, view academy-certified achievements, and track student advancement. Coaches can easily monitor student progress through the app.

**Highlights:** Register children via bracelet recognition, View academy-certified achievements, Track student progress, Coach student progress management, Subscription cancellation via App Store

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

**In-app purchases:** none


## Frequently asked questions

### Is SGS G21 free?

SGS G21 is free to download, with no in-app purchases.

### Is KFA 챌린지 free?

KFA 챌린지 is free to download, with no in-app purchases.

### Do SGS G21 or KFA 챌린지 have ads?

Neither SGS G21 nor KFA 챌린지 shows ads.

### Which is updated more often, SGS G21 or KFA 챌린지?

SGS G21 ships an update every 3 days, and KFA 챌린지 fortnightly. Most recently, SGS G21 was updated on September 17, 2026 and KFA 챌린지 on September 22, 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.*