# 第二種冷凍機械責任者 | 2026年対策問題 vs Ko4Study

The clearest difference is update cadence: Ko4Study at every 10 days against 第二種冷凍機械責任者 | 2026年対策問題's every 3 weeks. Ko4Study also leads on iOS requirement (15.1 vs 17.0). 第二種冷凍機械責任者 | 2026年対策問題's advantage is price ($2.99 vs $3.99). On ads, in-app purchases and device support there is nothing between them.

第二種冷凍機械責任者 | 2026年対策問題 costs $2.99 and Ko4Study $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

第二種冷凍機械責任者 | 2026年対策問題 ships an update every 3 weeks, Ko4Study every 10 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 第二種冷凍機械責任者 | 2026年対策問題 | Ko4Study |
| --- | --- | --- |
| Price | **$2.99** | $3.99 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | Paid | — |
| Size | 6 MB | 20 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Masaki Kobayashi](https://appshunter.io/developer/1882180437) | [TANI YUICHIRO](https://appshunter.io/developer/6782828819) |

## What reviewers say

### 第二種冷凍機械責任者 | 2026年対策問題

[App page](https://appshunter.io/ios/app/2026/id6777672583)

This app offers 800 original practice questions for the Type 2 Refrigeration Engineer exam. It organizes content by topic, provides detailed explanations for correct and incorrect answers, and supports offline use. The app aims to help users understand concepts rather than just memorize them.

**Highlights:** 800 original practice questions, Detailed explanations for answers, Topic-based learning, Randomized question order, Review incorrect answers, Offline access

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

**In-app purchases:** none


### Ko4Study

[App page](https://appshunter.io/ios/app/ko4study-fire-exam-japan/id6782828817)

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

**In-app purchases:** none


## Frequently asked questions

### Is 第二種冷凍機械責任者 | 2026年対策問題 free?

第二種冷凍機械責任者 | 2026年対策問題 costs $2.99, with no in-app purchases.

### Is Ko4Study free?

Ko4Study costs $3.99, with no in-app purchases.

### Do 第二種冷凍機械責任者 | 2026年対策問題 or Ko4Study have ads?

Neither 第二種冷凍機械責任者 | 2026年対策問題 nor Ko4Study shows ads.

### Which is updated more often, 第二種冷凍機械責任者 | 2026年対策問題 or Ko4Study?

第二種冷凍機械責任者 | 2026年対策問題 ships an update every 3 weeks, and Ko4Study every 10 days. Most recently, 第二種冷凍機械責任者 | 2026年対策問題 was updated on October 25, 2026 and Ko4Study on October 24, 2026.

---

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