# Dual N vs 2 Sides Challenge

The clearest difference is in-app purchases: 2 Sides Challenge at none against Dual N's 2. 2 Sides Challenge also leads on ads (none vs shown). Dual N's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and update cadence there is nothing between them.

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

Dual N ships an update fortnightly, 2 Sides Challenge every 10 days. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Dual N | 2 Sides Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (379 ratings)](https://appshunter.io/ios/app/dual-n-back-brain-training/id1578693948/reviews)** | — |
| Number of ratings | **379** | — |
| Positive reviews | 50.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 199 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GOKAKU SUPPLI, LIMITED LIABILITY CO.](https://appshunter.io/developer/1440310107) | [Dmitrii Nikolaev](https://appshunter.io/developer/1801292122) |

## 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 |


### 2 Sides Challenge

[App page](https://appshunter.io/ios/app/2-sides-challenge/id6790892823)

**In-app purchases:** none


## Frequently asked questions

### Is Dual N free?

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

### Is 2 Sides Challenge free?

2 Sides Challenge is free to download, with no in-app purchases.

### Do Dual N or 2 Sides Challenge have ads?

Dual N shows ads; 2 Sides Challenge does not.

### Which is updated more often, Dual N or 2 Sides Challenge?

Dual N ships an update fortnightly, and 2 Sides Challenge every 10 days. Most recently, Dual N was updated on November 7, 2026 and 2 Sides Challenge on November 8, 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.*