# 甲種危険物取扱者 一問一答問題集 vs Denken 3rd Class

The clearest difference is in-app purchases: Denken 3rd Class at none against 甲種危険物取扱者 一問一答問題集's 1. Denken 3rd Class also leads on device support (3 vs 1). 甲種危険物取扱者 一問一答問題集's advantage is ads (none vs shown). On price, update cadence and iOS requirement there is nothing between them.

Both are free to download. 甲種危険物取扱者 一問一答問題集 sells 1 one-off in-app purchase. Denken 3rd Class asks for nothing beyond the download.

甲種危険物取扱者 一問一答問題集 ships an update every 4 days, Denken 3rd Class every 3 days. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 甲種危険物取扱者 一問一答問題集 | Denken 3rd Class |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 10 MB | 65 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Particles and Waves](https://appshunter.io/developer/1812653811) | [hyuncheol seo](https://appshunter.io/developer/6797554122) |

## What reviewers say

### 甲種危険物取扱者 一問一答問題集

[App page](https://appshunter.io/ios/app/id6801183669)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Full Unlock) | $2.99 | one-time |


### Denken 3rd Class

[App page](https://appshunter.io/ios/app/denken-3rd-class-passrun/id6809243739)

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

**In-app purchases:** none


## Frequently asked questions

### Is 甲種危険物取扱者 一問一答問題集 free?

甲種危険物取扱者 一問一答問題集 is free to download, with in-app purchases available.

### Is Denken 3rd Class free?

Denken 3rd Class is free to download, with no in-app purchases.

### Do 甲種危険物取扱者 一問一答問題集 or Denken 3rd Class have ads?

Denken 3rd Class shows ads; 甲種危険物取扱者 一問一答問題集 does not.

### Which is updated more often, 甲種危険物取扱者 一問一答問題集 or Denken 3rd Class?

甲種危険物取扱者 一問一答問題集 ships an update every 4 days, and Denken 3rd Class every 3 days. Most recently, 甲種危険物取扱者 一問一答問題集 was updated on October 25, 2026 and Denken 3rd Class on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*