# N'Back Butterfly vs ArithmeticWorkOut

The clearest difference is iOS requirement: ArithmeticWorkOut at 13.0 against N'Back Butterfly's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

N'Back Butterfly ships an update every 10 months, ArithmeticWorkOut every 12 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | N'Back Butterfly | ArithmeticWorkOut |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 10 months** | Every 12 months |
| Monetization | Ad-supported | — |
| Size | 9 MB | 67 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [hideaki fukumura](https://appshunter.io/developer/1629984757) |

## What reviewers say

### N'Back Butterfly

[App page](https://appshunter.io/ios/app/nback-butterfly/id853507894)

Enhance your cognitive abilities and combat forgetfulness with this application designed to improve working memory. It utilizes the scientifically recognized n-back task to train your brain's capacity for information recall and manipulation.

**Highlights:** Working memory improvement, N-back task training, Cognitive neuroscience assessment, Continuous performance task

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

**In-app purchases:** none


### ArithmeticWorkOut

[App page](https://appshunter.io/ios/app/arithmeticworkout/id1632108931)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is N'Back Butterfly free?

N'Back Butterfly is free to download, with no in-app purchases.

### Is ArithmeticWorkOut free?

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

### Do N'Back Butterfly or ArithmeticWorkOut have ads?

Both N'Back Butterfly and ArithmeticWorkOut show ads.

### Which is updated more often, N'Back Butterfly or ArithmeticWorkOut?

N'Back Butterfly ships an update every 10 months, and ArithmeticWorkOut every 12 months. Most recently, N'Back Butterfly was updated on November 1, 2026 and ArithmeticWorkOut on November 7, 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.*