# 2級ボイラーの森 vs 下水道3種対策

The clearest difference is in-app purchases: 下水道3種対策 at none against 2級ボイラーの森's 1. 2級ボイラーの森's advantage is update cadence (every 3 weeks vs every 2 months). On ads, device support and iOS requirement there is nothing between them.

2級ボイラーの森 ships an update every 3 weeks, 下水道3種対策 every 2 months. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 2級ボイラーの森 | 下水道3種対策 |
| --- | --- | --- |
| Price | **Free** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | — | Free |
| Size | 99 MB | 36 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [合同会社OLA](https://appshunter.io/developer/1832165711) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## What reviewers say

### 2級ボイラーの森

[App page](https://appshunter.io/ios/app/2/id6747311296)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| すべての年度がアンロックされます | $3.99 | one-time |


### 下水道3種対策

[App page](https://appshunter.io/ios/app/3/id6768249358)

This app offers a comprehensive study guide for the 3rd Class Sewerage Technician certification exam. It features over 10,000 practice questions across 10 chapters, detailed explanations, and progress tracking. Study offline and customize your experience with dark/light themes.

**Highlights:** 10,000+ practice questions, 10 detailed chapters, Chapter-specific practice, Detailed explanations, Progress tracking and statistics, Offline functionality, Dark/light theme support

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

**In-app purchases:** none


## Frequently asked questions

### Is 2級ボイラーの森 free?

2級ボイラーの森 is free to download, with in-app purchases available.

### Is 下水道3種対策 free?

Pricing for 下水道3種対策 is not currently listed on the App Store.

### Do 2級ボイラーの森 or 下水道3種対策 have ads?

Neither 2級ボイラーの森 nor 下水道3種対策 shows ads.

### Which is updated more often, 2級ボイラーの森 or 下水道3種対策?

2級ボイラーの森 ships an update every 3 weeks, and 下水道3種対策 every 2 months. Most recently, 2級ボイラーの森 was updated on October 16, 2026 and 下水道3種対策 on October 9, 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.*