# マナビス４技能アプリ vs Boost.AI 英作文添削・共通テスト英語

The clearest difference is review sentiment: Boost.AI 英作文添削・共通テスト英語 at 91% against マナビス４技能アプリ's 25%. Boost.AI 英作文添削・共通テスト英語 also leads on update cadence (every 3 days vs every 3 months). マナビス４技能アプリ's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 15.0). 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. マナビス４技能アプリ asks for nothing beyond the download.

マナビス４技能アプリ ships an update every 3 months, Boost.AI 英作文添削・共通テスト英語 every 3 days. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | マナビス４技能アプリ | Boost.AI 英作文添削・共通テスト英語 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | **90.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 15 MB | 151 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [KAWAIJUKU MANAVIS,INC.](https://appshunter.io/developer/1052684872) | [ATSUSHI KIMURA](https://appshunter.io/developer/1829870349) |

## What reviewers say

### マナビス４技能アプリ

[App page](https://appshunter.io/ios/app/id1359598810)

**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)

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 |


## Frequently asked questions

### Is マナビス４技能アプリ free?

マナビス４技能アプリ 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 マナビス４技能アプリ or Boost.AI 英作文添削・共通テスト英語 have ads?

Neither マナビス４技能アプリ nor Boost.AI 英作文添削・共通テスト英語 shows ads.

### Which is updated more often, マナビス４技能アプリ or Boost.AI 英作文添削・共通テスト英語?

マナビス４技能アプリ ships an update every 3 months, and Boost.AI 英作文添削・共通テスト英語 every 3 days. Most recently, マナビス４技能アプリ was updated on November 2, 2026 and Boost.AI 英作文添削・共通テスト英語 on November 6, 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.*