# N'Back 10 vs Java SE 21 Practice Questions

The clearest difference is price: N'Back 10 at $2.99 against Java SE 21 Practice Questions's $6.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

N'Back 10 costs $2.99 and Java SE 21 Practice Questions $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | N'Back 10 | Java SE 21 Practice Questions |
| --- | --- | --- |
| Price | **$2.99** | $6.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nback-10/id588985886/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | — |
| Monetization | Paid | — |
| Size | 2 MB | 10 MB |
| Requires iOS | **16.0** | 16.3 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Buydeepdiscount.com LLC](https://appshunter.io/developer/817177888) |

## What reviewers say

### N'Back 10

[App page](https://appshunter.io/ios/app/nback-10/id588985886)

Enhance sensory and working memory with this cognitive training tool. It offers various modes and difficulty levels to challenge your recall abilities by matching current stimuli to those from a specified number of steps prior.

**Highlights:** N'Back training (1-Back to 10-Back), Flash Mode, Slow Mode, Step Mode, Sequence memorization, Stimulus matching

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

**In-app purchases:** none


### Java SE 21 Practice Questions

[App page](https://appshunter.io/ios/app/java-se-21-practice-questions/id6584512678)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is N'Back 10 free?

N'Back 10 costs $2.99, with no in-app purchases.

### Is Java SE 21 Practice Questions free?

Java SE 21 Practice Questions costs $6.99, with no in-app purchases.

### Do N'Back 10 or Java SE 21 Practice Questions have ads?

Neither N'Back 10 nor Java SE 21 Practice Questions shows ads.

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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.*