# N'Back Butterfly vs Particle World

The clearest difference is in-app purchases: N'Back Butterfly at none against Particle World's 2. Particle World's advantage is ads (none vs shown) and iOS requirement (8.0 vs 15.6). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. Particle World sells 2 one-off in-app purchases. N'Back Butterfly asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 10 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | N'Back Butterfly | Particle World |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/particle-world/id1144596687/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | Every 10 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 9 MB | 20 MB |
| Requires iOS | 15.6 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Foshan Youfou Technology Co., Ltd](https://appshunter.io/developer/1144596686) |

## 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


### Particle World

[App page](https://appshunter.io/ios/app/particle-world/id1144596687)

Navigate a challenging world by avoiding other particles. Utilize unique weapons like the Particle Gun and Gravity Field to survive and enhance your gameplay experience. This simple yet engaging game offers a fun way to test your reflexes.

**Highlights:** Particle avoidance gameplay, Particle Gun weapon, Gravity Field tool, Challenging survival mechanics, Simple, engaging controls

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Particle Gun | $0.99 | one-time |
| Anti-Gravity Field | $0.99 | one-time |


## Frequently asked questions

### Is N'Back Butterfly free?

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

### Is Particle World free?

Particle World is free to download, with in-app purchases available.

### Do N'Back Butterfly or Particle World have ads?

N'Back Butterfly shows ads; Particle World does not.

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

N'Back Butterfly ships an update every 10 months, and Particle World every 10 months. Most recently, N'Back Butterfly was updated on November 1, 2026 and Particle World on November 2, 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.*