# DMM Eikaiwa vs 公害防止管理者水質1種対策 500問

The clearest difference is price: DMM Eikaiwa at Free against 公害防止管理者水質1種対策 500問's $4.99. 公害防止管理者水質1種対策 500問's advantage is iOS requirement (15.1 vs 17.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

DMM Eikaiwa is free to download; 公害防止管理者水質1種対策 500問 costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DMM Eikaiwa ships an update every 6 weeks, 公害防止管理者水質1種対策 500問 every 2 months. The most recent releases landed on October 19, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | DMM Eikaiwa | 公害防止管理者水質1種対策 500問 |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dmm-eikaiwa/id6463775645/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 11 MB | 34 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad, Vision Pro | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DMM.com LLC](https://appshunter.io/developer/373765747) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## What reviewers say

### DMM Eikaiwa

[App page](https://appshunter.io/ios/app/dmm-eikaiwa/id6463775645)

Practice English skills with AI-powered tools. Engage in realistic conversations, get instant feedback on grammar and vocabulary, and access news articles tailored for language learners. Ask questions and receive immediate answers to accelerate your learning.

**Highlights:** Daily News for language learners, AI Role Play for conversation practice, AI Tutor for instant English questions, Grammar and word choice feedback, Japanese translations for AI responses, Text and audio input for practice

**In-app purchases:** none


### 公害防止管理者水質1種対策 500問

[App page](https://appshunter.io/ios/app/1-500/id6775329216)

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

**In-app purchases:** none


## Frequently asked questions

### Is DMM Eikaiwa free?

DMM Eikaiwa is free to download, with no in-app purchases.

### Is 公害防止管理者水質1種対策 500問 free?

公害防止管理者水質1種対策 500問 costs $4.99, with no in-app purchases.

### Do DMM Eikaiwa or 公害防止管理者水質1種対策 500問 have ads?

Neither DMM Eikaiwa nor 公害防止管理者水質1種対策 500問 shows ads.

### Which is updated more often, DMM Eikaiwa or 公害防止管理者水質1種対策 500問?

DMM Eikaiwa ships an update every 6 weeks, and 公害防止管理者水質1種対策 500問 every 2 months. Most recently, DMM Eikaiwa was updated on October 19, 2026 and 公害防止管理者水質1種対策 500問 on October 12, 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.*