# SD Academy vs NBack³

The clearest difference is in-app purchases: SD Academy at none against NBack³'s 1. SD Academy also leads on iOS requirement (11.0 vs 17.0). NBack³'s advantage is device support. On price there is nothing between them.

Both are free to download. NBack³ sells 1 in-app purchase, starting at $0.49 per month. SD Academy asks for nothing beyond the download.

## The numbers

| Metric | SD Academy | NBack³ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 71.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | — | Every 4 days |
| Monetization | — | Free with in-app purchases |
| Size | 196 MB | 20 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [NuVeda Learning Private Limited](https://appshunter.io/developer/1272718926) | [Taiki Nishimura](https://appshunter.io/developer/1780302048) |

## What reviewers say

### SD Academy

[App page](https://appshunter.io/ios/app/sd-academy/id1616628966)

**In-app purchases:** none


### NBack³

[App page](https://appshunter.io/ios/app/nback-memory-training-game/id6745750227)

This brain training app uses the scientifically proven Dual N-Back method to enhance cognitive functions like working memory, focus, and decision-making. It offers adjustable difficulty levels and tracks progress with a visually engaging interface.

**Highlights:** Dual N-Back method, Adjustable difficulty (n=1-5), Enhances working memory, Improves inhibitory control, Develops attention skills, Progress tracking, Streak bonus system

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $0.49 | per month |


## Frequently asked questions

### Is SD Academy free?

SD Academy is free to download, with no in-app purchases.

### Is NBack³ free?

NBack³ is free to download, with in-app purchases available.

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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.*