# 山川悟の詰将棋1 vs N'Back Butterfly

The clearest difference is ads: 山川悟の詰将棋1 at none against N'Back Butterfly's shown. 山川悟の詰将棋1 also leads on monetization model (free vs ad-supported) and iOS requirement (5.1.1 vs 15.6). N'Back Butterfly's advantage is update cadence (every 10 months vs every 21 months). 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.

山川悟の詰将棋1 ships an update every 21 months, N'Back Butterfly every 10 months. The most recent releases landed on July 7, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | 山川悟の詰将棋1 | N'Back Butterfly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/1/id525332386/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 21 months | **Every 10 months** |
| Monetization | **Free** | Ad-supported |
| Size | 26 MB | 9 MB |
| Requires iOS | **5.1.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KukiLabo](https://appshunter.io/developer/520133513) | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) |

## What reviewers say

### 山川悟の詰将棋1

[App page](https://appshunter.io/ios/app/1/id525332386)

Engage with a collection of 50 Shogi puzzles, ranging from easy 3-move to challenging 9-move problems. Offers hints and allows you to resume from where you left off. A blog link is also provided.

**Highlights:** 50 Shogi puzzles, 3-move to 9-move challenges, Hints available, Resume progress, Sequential problem unlocking, Links to author's blog

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is 山川悟の詰将棋1 free?

山川悟の詰将棋1 is free to download, with no in-app purchases.

### Is N'Back Butterfly free?

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

### Do 山川悟の詰将棋1 or N'Back Butterfly have ads?

N'Back Butterfly shows ads; 山川悟の詰将棋1 does not.

### Which is updated more often, 山川悟の詰将棋1 or N'Back Butterfly?

山川悟の詰将棋1 ships an update every 21 months, and N'Back Butterfly every 10 months. Most recently, 山川悟の詰将棋1 was updated on July 7, 2026 and N'Back Butterfly on August 31, 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.*