# Stroop! vs Dual N

The clearest difference is ads: Stroop! at none against Dual N's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Stroop! sells 1 one-off in-app purchase and Dual N sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Stroop! ships an update every 10 days, Dual N fortnightly. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Stroop! | Dual N |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (376 ratings)](https://appshunter.io/ios/app/dual-n-back-brain-training/id1578693948/reviews)** |
| Number of ratings | — | **376** |
| Positive reviews | — | 50.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 199 MB |
| Requires iOS | **14.4** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hector Forrester](https://appshunter.io/developer/1557103037) | [GOKAKU SUPPLI, LIMITED LIABILITY CO.](https://appshunter.io/developer/1440310107) |

## What reviewers say

### Stroop!

[App page](https://appshunter.io/ios/app/stroop/id1558361590)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Levels mode! | $0.99 | one-time |


### Dual N

[App page](https://appshunter.io/ios/app/dual-n-back-brain-training/id1578693948)

This app is a brain game designed to improve working memory and cognitive skills through a challenging memory-training exercise. It offers customizable difficulty, goal setting, and global leaderboards to track progress. An ad-free experience is available via a subscription.

**Highlights:** Working memory training, Customizable difficulty (N-value, interval, session length), Goal setting and reminders, Global leaderboards, Multilingual support, Ad-free Pro version

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NBack Monthly Subscription | $0.99 | per month |
| Lifetime Pass | $12.99 | one-time |


## Frequently asked questions

### Is Stroop! free?

Stroop! 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 Stroop! or Dual N have ads?

Dual N shows ads; Stroop! does not.

### Which is updated more often, Stroop! or Dual N?

Stroop! ships an update every 10 days, and Dual N fortnightly. Most recently, Stroop! was updated on October 25, 2026 and Dual N on October 27, 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.*