# N'Back Fan vs quantum error correction

The clearest difference is in-app purchases: quantum error correction at none against N'Back Fan's 1. quantum error correction also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. N'Back Fan sells 1 one-off in-app purchase. quantum error correction asks for nothing beyond the download.

## The numbers

| Metric | N'Back Fan | quantum error correction |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | — |
| Size | 7 MB | 5 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### N'Back Fan

[App page](https://appshunter.io/ios/app/nback-fan/id6449070102)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| remove ads and extend to 12 | $1.99 | one-time |


### quantum error correction

[App page](https://appshunter.io/ios/app/quantum-error-correction/id6504707563)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is N'Back Fan free?

N'Back Fan is free to download, with in-app purchases available.

### Is quantum error correction free?

quantum error correction is free to download, with no in-app purchases.

### Do N'Back Fan or quantum error correction have ads?

N'Back Fan shows ads; quantum error correction does not.

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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.*