# NBack³ vs Large Math Drill

NBack³ and Large Math Drill are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. NBack³ sells 1 in-app purchase, starting at $0.49 per month and Large Math Drill sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | NBack³ | Large Math Drill |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 18 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Taiki Nishimura](https://appshunter.io/developer/1780302048) | [Yuto Inagaki](https://appshunter.io/developer/1733484400) |

## What reviewers say

### 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 |


### Large Math Drill

[App page](https://appshunter.io/ios/app/large-math-drill-mental-math/id6748839939)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム会員 | $2.99 | one-time |


## Frequently asked questions

### Is NBack³ free?

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

### Is Large Math Drill free?

Large Math Drill is free to download, with in-app purchases available.

### Do NBack³ or Large Math Drill have ads?

Both NBack³ and Large Math Drill show ads.

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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.*