# Electro Math vs 下水道3種対策

The clearest difference is in-app purchases: 下水道3種対策 at none against Electro Math's 1. Electro Math's advantage is update cadence (daily vs every 2 months) and iOS requirement (13.0 vs 15.1). On ads and device support there is nothing between them.

Electro Math ships an update daily, 下水道3種対策 every 2 months. Both last shipped on November 5, 2026.

## The numbers

| Metric | Electro Math | 下水道3種対策 |
| --- | --- | --- |
| Price | **Free** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 months |
| Monetization | — | Free |
| Size | 44 MB | 36 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ASUKA MINAMOTO](https://appshunter.io/developer/1855336606) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## What reviewers say

### Electro Math

[App page](https://appshunter.io/ios/app/electro-math/id6755659770)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| サブスクリプション（定期購読） | $2.99 | per month |


### 下水道3種対策

[App page](https://appshunter.io/ios/app/3/id6768249358)

This app offers a comprehensive study guide for the 3rd Class Sewerage Technician certification exam. It features over 10,000 practice questions across 10 chapters, detailed explanations, and progress tracking. Study offline and customize your experience with dark/light themes.

**Highlights:** 10,000+ practice questions, 10 detailed chapters, Chapter-specific practice, Detailed explanations, Progress tracking and statistics, Offline functionality, Dark/light theme support

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

**In-app purchases:** none


## Frequently asked questions

### Is Electro Math free?

Electro Math is free to download, with in-app purchases available.

### Is 下水道3種対策 free?

Pricing for 下水道3種対策 is not currently listed on the App Store.

### Do Electro Math or 下水道3種対策 have ads?

Neither Electro Math nor 下水道3種対策 shows ads.

### Which is updated more often, Electro Math or 下水道3種対策?

Electro Math ships an update daily, and 下水道3種対策 every 2 months. Most recently, Electro Math was updated on November 5, 2026 and 下水道3種対策 on November 5, 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.*