# 危険物乙４類取扱者試験問題集　りすさんシリーズ vs 2021年1級機械保全技能士学科過去問

The clearest difference is review sentiment: 2021年1級機械保全技能士学科過去問 at 33% against 危険物乙４類取扱者試験問題集　りすさんシリーズ's 0%. 2021年1級機械保全技能士学科過去問 also leads on price ($1.99 vs $2.99) and iOS requirement (15.0 vs 18.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

危険物乙４類取扱者試験問題集　りすさんシリーズ costs $2.99 and 2021年1級機械保全技能士学科過去問 $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 危険物乙４類取扱者試験問題集　りすさんシリーズ | 2021年1級機械保全技能士学科過去問 |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Positive reviews | 0.0% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | — | Paid |
| Size | 6 MB | 7 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kazuki Baba](https://appshunter.io/developer/903350438) | [shinji ikeda](https://appshunter.io/developer/1615407188) |

## What reviewers say

### 危険物乙４類取扱者試験問題集　りすさんシリーズ

[App page](https://appshunter.io/ios/app/id903629821)

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

**In-app purchases:** none


### 2021年1級機械保全技能士学科過去問

[App page](https://appshunter.io/ios/app/20211/id1644890831)

This app provides practice questions for the 2021 Level 1 Mechanical Maintenance Engineer exam. It offers various study modes, including all questions, checked questions, and incorrect questions, with explanations to deepen understanding. Users can also set their exam date to track remaining days.

**Highlights:** Practice exam questions, Study modes (all, checked, incorrect), Detailed answer explanations, Exam date countdown, Offline study capability

**In-app purchases:** none


## Frequently asked questions

### Is 危険物乙４類取扱者試験問題集　りすさんシリーズ free?

危険物乙４類取扱者試験問題集　りすさんシリーズ costs $2.99, with no in-app purchases.

### Is 2021年1級機械保全技能士学科過去問 free?

2021年1級機械保全技能士学科過去問 costs $1.99, with no in-app purchases.

### Do 危険物乙４類取扱者試験問題集　りすさんシリーズ or 2021年1級機械保全技能士学科過去問 have ads?

Neither 危険物乙４類取扱者試験問題集　りすさんシリーズ nor 2021年1級機械保全技能士学科過去問 shows ads.

### Which is updated more often, 危険物乙４類取扱者試験問題集　りすさんシリーズ or 2021年1級機械保全技能士学科過去問?

危険物乙４類取扱者試験問題集　りすさんシリーズ ships an update every 2 months, and 2021年1級機械保全技能士学科過去問 every 2 months. Most recently, 危険物乙４類取扱者試験問題集　りすさんシリーズ was updated on November 1, 2026 and 2021年1級機械保全技能士学科過去問 on November 3, 2026.

---

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