# TestSTMemory vs Dual N

The clearest difference is price: Dual N at Free against TestSTMemory's $2.99. TestSTMemory's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Dual N is free to download; TestSTMemory costs $2.99 up front. Dual N sells 2 in-app purchases, starting at $3.99 per month. TestSTMemory asks for nothing beyond the download.

## The numbers

| Metric | TestSTMemory | Dual N |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 13 months | — |
| Size | 2 MB | 27 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Viacheslav Romanenko](https://appshunter.io/developer/1046372418) | [Konstanty Koszewski](https://appshunter.io/developer/1871696981) |

## What reviewers say

### TestSTMemory

[App page](https://appshunter.io/ios/app/teststmemory/id1358135078)

**Features:** Vision Pro support

**In-app purchases:** none


### Dual N

[App page](https://appshunter.io/ios/app/dual-n-back-memory-trainer/id6759211886)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dual N-back Monthly Premium | $3.99 | per month |
| Dual N-back Yearly Premium | $29.99 | per year |


## Frequently asked questions

### Is TestSTMemory free?

TestSTMemory costs $2.99, with no in-app purchases.

### Is Dual N free?

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

### Do TestSTMemory or Dual N have ads?

Dual N shows ads; TestSTMemory does not.

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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.*