# N'Back Butterfly vs GLURMB!

The clearest difference is ads: GLURMB! at none against N'Back Butterfly's shown. N'Back Butterfly's advantage is update cadence (every 10 months vs every 40 months). On price, in-app purchases, device support and iOS requirement 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, GLURMB! every 40 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | N'Back Butterfly | GLURMB! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/glurmb/id1621807499/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 10 months** | Every 40 months |
| Monetization | Ad-supported | — |
| Size | 9 MB | 1 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Jonah Scheib](https://appshunter.io/developer/1621807501) |

## 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


### GLURMB!

[App page](https://appshunter.io/ios/app/glurmb/id1621807499)

**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 GLURMB! free?

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

### Do N'Back Butterfly or GLURMB! have ads?

N'Back Butterfly shows ads; GLURMB! does not.

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

N'Back Butterfly ships an update every 10 months, and GLURMB! every 40 months. Most recently, N'Back Butterfly was updated on October 25, 2026 and GLURMB! on October 24, 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.*