# N'Back Butterfly vs Enigma

The clearest difference is ads: Enigma at none against N'Back Butterfly's shown. Enigma also leads on update cadence (every 3 months vs every 10 months) and iOS requirement (13.0 vs 15.6). On price, in-app purchases and device support 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, Enigma every 3 months. The most recent releases landed on October 20, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | N'Back Butterfly | Enigma |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Every 3 months** |
| Monetization | Ad-supported | — |
| Size | 9 MB | 466 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Corey Clark](https://appshunter.io/developer/1578949040) |

## 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


### Enigma

[App page](https://appshunter.io/ios/app/enigma-essentials-i/id6504303873)

**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 Enigma free?

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

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

N'Back Butterfly shows ads; Enigma does not.

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

N'Back Butterfly ships an update every 10 months, and Enigma every 3 months. Most recently, N'Back Butterfly was updated on October 20, 2026 and Enigma on October 13, 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.*