# Dual N vs QBco

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

Both are free to download. Dual N sells 2 in-app purchases, starting at $0.99 per month. QBco asks for nothing beyond the download.

Dual N ships an update fortnightly, QBco every 9 days. The most recent releases landed on October 18, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Dual N | QBco |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (362 ratings)](https://appshunter.io/ios/app/dual-n-back-brain-training/id1578693948/reviews)** | — |
| Number of ratings | **362** | — |
| Positive reviews | 50.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 199 MB | 160 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GOKAKU SUPPLI, LIMITED LIABILITY CO.](https://appshunter.io/developer/1440310107) | [MANUEL HOSSEINI SOHI](https://appshunter.io/developer/1708604663) |

## What reviewers say

### 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 |


### QBco

[App page](https://appshunter.io/ios/app/qbco/id6523430640)

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

**In-app purchases:** none


## Frequently asked questions

### Is Dual N free?

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

### Is QBco free?

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

### Do Dual N or QBco have ads?

Dual N shows ads; QBco does not.

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

Dual N ships an update fortnightly, and QBco every 9 days. Most recently, Dual N was updated on October 18, 2026 and QBco on October 2, 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.*