# Boost.AI 英作文添削・共通テスト英語 vs 虎猫出版

The clearest difference is in-app purchases: 虎猫出版 at none against Boost.AI 英作文添削・共通テスト英語's 3. Boost.AI 英作文添削・共通テスト英語's advantage is update cadence (every 4 days vs fortnightly) and iOS requirement (15.0 vs 17.0). On price, 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. 虎猫出版 asks for nothing beyond the download.

Boost.AI 英作文添削・共通テスト英語 ships an update every 4 days, 虎猫出版 fortnightly. Both last shipped on October 28, 2026.

## The numbers

| Metric | Boost.AI 英作文添削・共通テスト英語 | 虎猫出版 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | Freemium | — |
| Size | 151 MB | 28 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ATSUSHI KIMURA](https://appshunter.io/developer/1829870349) | [Shuhei Okazaki](https://appshunter.io/developer/1881640448) |

## What reviewers say

### 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 |


### 虎猫出版

[App page](https://appshunter.io/ios/app/id6762460938)

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

**In-app purchases:** none


## Frequently asked questions

### 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.

### Is 虎猫出版 free?

虎猫出版 is free to download, with no in-app purchases.

### Do Boost.AI 英作文添削・共通テスト英語 or 虎猫出版 have ads?

Neither Boost.AI 英作文添削・共通テスト英語 nor 虎猫出版 shows ads.

### Which is updated more often, Boost.AI 英作文添削・共通テスト英語 or 虎猫出版?

Boost.AI 英作文添削・共通テスト英語 ships an update every 4 days, and 虎猫出版 fortnightly. Most recently, Boost.AI 英作文添削・共通テスト英語 was updated on October 28, 2026 and 虎猫出版 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.*