# NBack 3D vs 便利英単語速習

The clearest difference is update cadence: 便利英単語速習 at weekly against NBack 3D's every 10 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. NBack 3D sells 1 one-off in-app purchase and 便利英単語速習 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

NBack 3D ships an update every 10 months, 便利英単語速習 weekly. The most recent releases landed on October 27, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | NBack 3D | 便利英単語速習 |
| --- | --- | --- |
| 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 | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 10 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 43 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [katapu.net](https://appshunter.io/developer/381898924) |

## 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 |


### 便利英単語速習

[App page](https://appshunter.io/ios/app/id6761370374)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告削除 | $5.99 | one-time |


## Frequently asked questions

### Is NBack 3D free?

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

### Is 便利英単語速習 free?

便利英単語速習 is free to download, with in-app purchases available.

### Do NBack 3D or 便利英単語速習 have ads?

Both NBack 3D and 便利英単語速習 show ads.

### Which is updated more often, NBack 3D or 便利英単語速習?

NBack 3D ships an update every 10 months, and 便利英単語速習 weekly. Most recently, NBack 3D was updated on October 27, 2026 and 便利英単語速習 on October 26, 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.*