# NBackCalc vs Dual N

The clearest difference is ads: NBackCalc at none against Dual N's shown. NBackCalc also leads on update cadence (every 2 days vs every 5 days). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. NBackCalc sells 1 one-off in-app purchase and Dual N sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

NBackCalc ships an update every 2 days, Dual N every 5 days. The most recent releases landed on October 17, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | NBackCalc | Dual N |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Every 5 days |
| Size | 1 MB | 13 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YOSHINORI KONNO](https://appshunter.io/developer/1883074860) | [Takanori Horitsu](https://appshunter.io/developer/1896386009) |

## What reviewers say

### NBackCalc

[App page](https://appshunter.io/ios/app/nbackcalc-working-memory/id6760832395)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 開発者を応援する | $0.99 | one-time |


### Dual N

[App page](https://appshunter.io/ios/app/dual-n-back-brain-trainer/id6767109556)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-Free | $0.99 | one-time |


## Frequently asked questions

### Is NBackCalc free?

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

### Is Dual N free?

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

### Do NBackCalc or Dual N have ads?

Dual N shows ads; NBackCalc does not.

### Which is updated more often, NBackCalc or Dual N?

NBackCalc ships an update every 2 days, and Dual N every 5 days. Most recently, NBackCalc was updated on October 17, 2026 and Dual N on October 18, 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.*