# Boost.AI 英作文添削・共通テスト英語 vs 青山ハック

The clearest difference is in-app purchases: 青山ハック at none against Boost.AI 英作文添削・共通テスト英語's 3. On price, update cadence, 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. 青山ハック asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Boost.AI 英作文添削・共通テスト英語 | 青山ハック |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 90.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 days | Every 3 days |
| Monetization | Freemium | — |
| Size | 151 MB | 35 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ATSUSHI KIMURA](https://appshunter.io/developer/1829870349) | [Leo Yonezawa](https://appshunter.io/developer/1842576529) |

## 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)

Practice past Common Test English exams with AI-powered essay correction. Improve reading, listening, and writing skills with detailed feedback and practice exercises. Review vocabulary and grammar to prepare for university entrance exams and English proficiency tests.

**Highlights:** Common Test reading and listening practice, AI essay correction for free writing and translation, Review vocabulary and grammar, Photo upload for handwritten essay correction, AI chat for clarification on corrections, Practice for university entrance exams and English tests

**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 |


### 青山ハック

[App page](https://appshunter.io/ios/app/id6753123578)

**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 青山ハック free?

青山ハック 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 青山ハック have ads?

Neither Boost.AI 英作文添削・共通テスト英語 nor 青山ハック shows ads.

### Which is updated more often, Boost.AI 英作文添削・共通テスト英語 or 青山ハック?

Boost.AI 英作文添削・共通テスト英語 ships an update every 3 days, and 青山ハック every 3 days. Most recently, Boost.AI 英作文添削・共通テスト英語 was updated on November 6, 2026 and 青山ハック on October 30, 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.*