# NBack 3D vs P.S. 328 Phyllis Wheatley

The clearest difference is in-app purchases: P.S. 328 Phyllis Wheatley at none against NBack 3D's 1. P.S. 328 Phyllis Wheatley also leads on ads (none vs shown) and update cadence (every 2 months vs every 10 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. NBack 3D sells 1 one-off in-app purchase. P.S. 328 Phyllis Wheatley asks for nothing beyond the download.

NBack 3D ships an update every 10 months, P.S. 328 Phyllis Wheatley every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | NBack 3D | P.S. 328 Phyllis Wheatley |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nback-3d/id1407606652/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 238 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Solved Education Consultancy, LLC](https://appshunter.io/developer/1506645558) |

## 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 |


### P.S. 328 Phyllis Wheatley

[App page](https://appshunter.io/ios/app/ps-328-phyllis-wheatley/id1534624329)

**In-app purchases:** none


## Frequently asked questions

### Is NBack 3D free?

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

### Is P.S. 328 Phyllis Wheatley free?

P.S. 328 Phyllis Wheatley is free to download, with no in-app purchases.

### Do NBack 3D or P.S. 328 Phyllis Wheatley have ads?

NBack 3D shows ads; P.S. 328 Phyllis Wheatley does not.

### Which is updated more often, NBack 3D or P.S. 328 Phyllis Wheatley?

NBack 3D ships an update every 10 months, and P.S. 328 Phyllis Wheatley every 2 months. Most recently, NBack 3D was updated on November 2, 2026 and P.S. 328 Phyllis Wheatley on November 3, 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.*