# 小学4年生 算数ランド vs 公害防止管理者水質4種対策

The clearest difference is price: 小学4年生 算数ランド at Free against 公害防止管理者水質4種対策's $4.99. 小学4年生 算数ランド also leads on iOS requirement (12.0 vs 15.1). 公害防止管理者水質4種対策's advantage is in-app purchases (none vs 2) and ads (none vs shown). On update cadence and device support there is nothing between them.

小学4年生 算数ランド is free to download; 公害防止管理者水質4種対策 costs $4.99 up front. 小学4年生 算数ランド sells 2 in-app purchases, starting at $0.99 per month. 公害防止管理者水質4種対策 asks for nothing beyond the download.

小学4年生 算数ランド ships an update every 2 weeks, 公害防止管理者水質4種対策 monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | 小学4年生 算数ランド | 公害防止管理者水質4種対策 |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/4-4/id1463947670/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 34 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Junpei Shimotsu](https://appshunter.io/developer/882299124) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## What reviewers say

### 小学4年生 算数ランド

[App page](https://appshunter.io/ios/app/4-4/id1463947670)

This free educational app offers 680 math problems covering the entire 4th-grade curriculum. It helps children build foundational math skills through interactive drills, progress tracking, and motivational rewards. Ideal for homework, test preparation, and overcoming math challenges.

**Highlights:** 680 math problems for 4th grade, Covers all 4th-grade math topics, Progress tracking with checkmarks, Earn gold, silver, and bronze medals, Identify strengths and weaknesses, Simple interface for parents and children, Learn anytime, anywhere

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告削除 | $0.99 | per month |
| 広告削除 買い切り | $1.99 | one-time |


### 公害防止管理者水質4種対策

[App page](https://appshunter.io/ios/app/4/id6775329695)

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

**In-app purchases:** none


## Frequently asked questions

### Is 小学4年生 算数ランド free?

小学4年生 算数ランド is free to download, with in-app purchases available.

### Is 公害防止管理者水質4種対策 free?

公害防止管理者水質4種対策 costs $4.99, with no in-app purchases.

### Do 小学4年生 算数ランド or 公害防止管理者水質4種対策 have ads?

小学4年生 算数ランド shows ads; 公害防止管理者水質4種対策 does not.

### Which is updated more often, 小学4年生 算数ランド or 公害防止管理者水質4種対策?

小学4年生 算数ランド ships an update every 2 weeks, and 公害防止管理者水質4種対策 monthly. Most recently, 小学4年生 算数ランド was updated on October 5, 2026 and 公害防止管理者水質4種対策 on October 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.*