# 無機化学 vs Boost.AI 英作文添削・共通テスト英語

The clearest difference is in-app purchases: 無機化学 at none against Boost.AI 英作文添削・共通テスト英語's 3. 無機化学 also leads on update cadence (every 2 days vs every 4 days). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Boost.AI 英作文添削・共通テスト英語 sells 3 in-app purchases, starting at $5.99 per month. 無機化学 asks for nothing beyond the download.

無機化学 ships an update every 2 days, Boost.AI 英作文添削・共通テスト英語 every 4 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 無機化学 | Boost.AI 英作文添削・共通テスト英語 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/id1351078183/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **98.1% of reviews** | 90.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | — | Freemium |
| Size | 40 MB | 151 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideki Touhara](https://appshunter.io/developer/1268738829) | [ATSUSHI KIMURA](https://appshunter.io/developer/1829870349) |

## What reviewers say

### 無機化学

[App page](https://appshunter.io/ios/app/id1351078183)

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

**In-app purchases:** none


### Boost.AI 英作文添削・共通テスト英語

[App page](https://appshunter.io/ios/app/boostai/id6749287559)

This AI-powered app offers instant English writing feedback, detailed explanations, and AI chat for deeper understanding. It supports various writing styles and learning goals, helping users improve their English proficiency anytime, anywhere.

**Highlights:** Instant AI essay correction, Detailed explanations for errors, Handwriting recognition for essays, AI chat for clarification, Learning history management, Diverse question formats, Flashcards and English news

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Boost Pro 月額プラン | $5.99 | per month |
| 3ヶ月 | $11.99 | per 3 months |
| Boost Pro 年額プラン | $39.99 | per year |


## Frequently asked questions

### Is 無機化学 free?

無機化学 is free to download, with no in-app purchases.

### Is Boost.AI 英作文添削・共通テスト英語 free?

Boost.AI 英作文添削・共通テスト英語 is free to download, with in-app purchases available.

### Do 無機化学 or Boost.AI 英作文添削・共通テスト英語 have ads?

Neither 無機化学 nor Boost.AI 英作文添削・共通テスト英語 shows ads.

### Which is updated more often, 無機化学 or Boost.AI 英作文添削・共通テスト英語?

無機化学 ships an update every 2 days, and Boost.AI 英作文添削・共通テスト英語 every 4 days. Most recently, 無機化学 was updated on October 26, 2026 and Boost.AI 英作文添削・共通テスト英語 on October 28, 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.*