# Dual N vs SFDC認定アプリケーションビルダー資格試験対策

The clearest difference is update cadence: Dual N at every 10 days against SFDC認定アプリケーションビルダー資格試験対策's every 3 weeks. SFDC認定アプリケーションビルダー資格試験対策's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Dual N sells 2 in-app purchases, starting at $1.99 per month and SFDC認定アプリケーションビルダー資格試験対策 sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Dual N ships an update every 10 days, SFDC認定アプリケーションビルダー資格試験対策 every 3 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Dual N | SFDC認定アプリケーションビルダー資格試験対策 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (19 ratings)](https://appshunter.io/ios/app/dual-n-back-adhd-focus-game/id1568448504/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 48.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 39 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hiromi Fujita](https://appshunter.io/developer/1364801021) | [RUOK LLC](https://appshunter.io/developer/1867680933) |

## What reviewers say

### Dual N

[App page](https://appshunter.io/ios/app/dual-n-back-adhd-focus-game/id1568448504)

This scientifically proven brain training app enhances working memory, concentration, and cognitive abilities. It helps improve IQ, memory, and thinking speed through engaging gameplay that challenges your brain. Consistent practice leads to noticeable improvements in focus and mental agility.

**Highlights:** Strengthens working memory, Improves concentration, Enhances cognitive abilities, Difficulty adjustment (N-2 to N-5), Progress visualization with graphs, Statistics and calendar tracking, Global player rankings

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Features | $1.99 | per month |
| Annual Premium Features | $19.99 | per year |


### SFDC認定アプリケーションビルダー資格試験対策

[App page](https://appshunter.io/ios/app/sfdc/id6762074256)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ウィークリープレミアムアクセス | $2.99 | per 7 days |
| 全問解放 | $22.99 | one-time |


## Frequently asked questions

### Is Dual N free?

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

### Is SFDC認定アプリケーションビルダー資格試験対策 free?

SFDC認定アプリケーションビルダー資格試験対策 is free to download, with in-app purchases available.

### Do Dual N or SFDC認定アプリケーションビルダー資格試験対策 have ads?

Neither Dual N nor SFDC認定アプリケーションビルダー資格試験対策 shows ads.

### Which is updated more often, Dual N or SFDC認定アプリケーションビルダー資格試験対策?

Dual N ships an update every 10 days, and SFDC認定アプリケーションビルダー資格試験対策 every 3 weeks. Most recently, Dual N was updated on November 3, 2026 and SFDC認定アプリケーションビルダー資格試験対策 on October 31, 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.*