# 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 vs Ko4Study

The clearest difference is price: 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 at Free against Ko4Study's $3.99. Ko4Study's advantage is iOS requirement (15.1 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 is free to download; Ko4Study costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 ships an update weekly, Ko4Study every 10 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 | Ko4Study |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | Freemium | — |
| Size | 4 MB | 20 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shunya Iwasaki](https://appshunter.io/developer/1796095304) | [TANI YUICHIRO](https://appshunter.io/developer/6782828819) |

## What reviewers say

### 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験

[App page](https://appshunter.io/ios/app/444/id6780047715)

This app provides comprehensive study materials for the Fire Equipment Officer Level 4 (Class A and B) exams. It offers one-on-one practice questions, practical skill drills for identification and drafting, and full-scale mock tests. Study offline and optimize your learning with personalized exam settings.

**Highlights:** One-on-one practice questions by subject, Practical skill drills for identification and drafting, Full-scale mock exams with performance analysis, Personalized exam settings for Class A/B, Offline study support, Progress tracking and visualization

**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 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 free?

消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 is free to download, with no in-app purchases.

### Is Ko4Study free?

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

### Do 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 or Ko4Study have ads?

Neither 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 nor Ko4Study shows ads.

### Which is updated more often, 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 or Ko4Study?

消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 ships an update weekly, and Ko4Study every 10 days. Most recently, 消防設備士 4類（甲4・乙4）合格ドリル｜一問一答・模擬試験 was updated on October 24, 2026 and Ko4Study on October 24, 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.*