# N'Back Butterfly vs Drizzle Dive

The clearest difference is ads: Drizzle Dive at none against N'Back Butterfly's shown. N'Back Butterfly's advantage is update cadence (every 10 months vs every 36 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, Drizzle Dive every 36 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | N'Back Butterfly | Drizzle Dive |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 10 months** | Every 36 months |
| Monetization | Ad-supported | — |
| Size | 9 MB | 1 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Paweł Supeł](https://appshunter.io/developer/1669210434) |

## 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


### Drizzle Dive

[App page](https://appshunter.io/ios/app/drizzle-dive/id6455042002)

**Features:** Vision Pro support

**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 Drizzle Dive free?

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

### Do N'Back Butterfly or Drizzle Dive have ads?

N'Back Butterfly shows ads; Drizzle Dive does not.

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

N'Back Butterfly ships an update every 10 months, and Drizzle Dive every 36 months. Most recently, N'Back Butterfly was updated on November 1, 2026 and Drizzle Dive on November 3, 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.*