# 「ヒロシマの記憶AR」 vs Math Bird Challenge

The clearest difference is ads: 「ヒロシマの記憶AR」 at none against Math Bird Challenge's shown. 「ヒロシマの記憶AR」 also leads on monetization model (free vs ad-supported) and iOS requirement (11.0 vs 13.0). Math Bird Challenge's advantage is review sentiment (100% vs 67%). 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.

## The numbers

| Metric | 「ヒロシマの記憶AR」 | Math Bird Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | — |
| Monetization | **Free** | Ad-supported |
| Size | 531 MB | 36 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TIMELOOPER INC](https://appshunter.io/developer/1198864036) | [Tomohiro Kosaka](https://appshunter.io/developer/1095373790) |

## What reviewers say

### 「ヒロシマの記憶AR」

[App page](https://appshunter.io/ios/app/ar/id1559638908)

Experience historical accounts and materials related to the 1945 Hiroshima atomic bombing and the Peace Memorial Park before the bombing. Features the world's first holographic testimony from a survivor, aiming to inspire reflection on peace.

**Highlights:** AR/VR historical experience, Atomic bombing accounts and materials, Pre-bombing Peace Memorial Park visuals, Holographic survivor testimony, Peace reflection tool

**In-app purchases:** none


### Math Bird Challenge

[App page](https://appshunter.io/ios/app/math-bird-challenge/id6756185149)

This app makes learning arithmetic engaging by combining classic arcade gameplay with math challenges. Players tap to navigate obstacles while solving addition and subtraction problems, with difficulty increasing as their score rises. It's designed for children aged 5-12 to build math skills through fun, reward-based play.

**Highlights:** Arithmetic practice integrated with gameplay, Progressive difficulty levels, Strengthens mental arithmetic, Improves calculation speed, Works offline, Simple one-tap controls

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

**In-app purchases:** none


## Frequently asked questions

### Is 「ヒロシマの記憶AR」 free?

「ヒロシマの記憶AR」 is free to download, with no in-app purchases.

### Is Math Bird Challenge free?

Math Bird Challenge is free to download, with no in-app purchases.

### Do 「ヒロシマの記憶AR」 or Math Bird Challenge have ads?

Math Bird Challenge shows ads; 「ヒロシマの記憶AR」 does not.

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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.*