# NBack 3D vs Dual N

The clearest difference is rating: NBack 3D at 5.0 against Dual N's 4.4. NBack 3D also leads on review sentiment (100% vs 67%) and device support (3 vs 1). Dual N's advantage is ads (none vs shown) and update cadence (every 6 days vs every 10 months). On price, in-app purchases and monetization model there is nothing between them.

Both are free to download. NBack 3D sells 1 one-off in-app purchase and Dual N sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

NBack 3D holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Dual N has 12 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of NBack 3D's written reviews are positive against 67% of Dual N's.

NBack 3D ships an update every 10 months, Dual N every 6 days. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | NBack 3D | Dual N |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nback-3d/id1407606652/reviews)** | [4.4 (12 ratings)](https://appshunter.io/ios/app/dual-n-back-extreme/id6744034751/reviews) |
| Number of ratings | 1 | **12** |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Every 6 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 5 MB | 68 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Jatin Thakur](https://appshunter.io/developer/1805656547) |

## What reviewers say

### NBack 3D

[App page](https://appshunter.io/ios/app/nback-3d/id1407606652)

This app challenges your memory by requiring you to count 3D shapes of specific colors. As the 'N' value increases, the difficulty escalates, testing your ability to recall past stimuli in a sequence.

**Highlights:** N-Back memory challenge, 3D shape and color recognition, Increasing difficulty levels, Sequence memorization, Cognitive skill enhancement

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extend to 20'Back & Remove Ads | $2.99 | one-time |


### Dual N

[App page](https://appshunter.io/ios/app/dual-n-back-extreme/id6744034751)

This app offers brain-training exercises to enhance working memory, concentration, and problem-solving skills. It features multiple N-back modes, progress tracking, and customizable sessions in a user-friendly interface.

**Highlights:** Dual, Triple & Quad N-Back modes, Cognitive performance enhancement, Progress tracking and statistics, Customizable training sessions, User-friendly interface

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| N Back Extreme Monthly Subscription | $4.99 | per month |
| Six Months | $4.99 | per 6 months |
| N Back Extreme Yearly Subscription | $29.99 | per year |


## Frequently asked questions

### Is NBack 3D free?

NBack 3D is free to download, with in-app purchases available.

### Is Dual N free?

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

### Which has better reviews, NBack 3D or Dual N?

NBack 3D is rated higher. NBack 3D averages 5.0 out of 5 from 1 ratings, while Dual N averages 4.4 from 12 ratings.

### Do NBack 3D or Dual N have ads?

NBack 3D shows ads; Dual N does not.

### Which is updated more often, NBack 3D or Dual N?

NBack 3D ships an update every 10 months, and Dual N every 6 days. Most recently, NBack 3D was updated on November 2, 2026 and Dual N on October 30, 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.*