# Number Recall vs NBack 3D

The clearest difference is in-app purchases: Number Recall at none against NBack 3D's 1. Number Recall also leads on ads (none vs shown). NBack 3D's advantage is update cadence (every 10 months vs every 39 months) and iOS requirement (15.6 vs 17.0). On price and device support there is nothing between them.

Both are free to download. NBack 3D sells 1 one-off in-app purchase. Number Recall asks for nothing beyond the download.

Number Recall ships an update every 39 months, NBack 3D every 10 months. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Number Recall | NBack 3D |
| --- | --- | --- |
| 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 | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 39 months | **Every 10 months** |
| Monetization | — | Free with in-app purchases |
| Size | 43 MB | 5 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [BrainTrain Inc.](https://appshunter.io/developer/584469134) | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) |

## What reviewers say

### Number Recall

[App page](https://appshunter.io/ios/app/number-recall-memory-trainer/id1211281879)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Number Recall free?

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

### Is NBack 3D free?

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

### Do Number Recall or NBack 3D have ads?

NBack 3D shows ads; Number Recall does not.

### Which is updated more often, Number Recall or NBack 3D?

Number Recall ships an update every 39 months, and NBack 3D every 10 months. Most recently, Number Recall was updated on November 11, 2026 and NBack 3D on November 6, 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.*