# Boost.AI 英作文添削・共通テスト英語 vs 医傑

The clearest difference is review sentiment: Boost.AI 英作文添削・共通テスト英語 at 90% against 医傑's 79%. Boost.AI 英作文添削・共通テスト英語 also leads on update cadence (every 4 days vs every 9 days) and iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases 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 and 医傑 sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Boost.AI 英作文添削・共通テスト英語 ships an update every 4 days, 医傑 every 9 days. The most recent releases landed on October 20, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Boost.AI 英作文添削・共通テスト英語 | 医傑 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **90.5% of reviews** | 78.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 9 days |
| Monetization | Freemium | — |
| Size | 143 MB | 108 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [ATSUSHI KIMURA](https://appshunter.io/developer/1829870349) | [Dai Matsuda](https://appshunter.io/developer/6779583889) |

## 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 |


### 医傑

[App page](https://appshunter.io/ios/app/id6779583887)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 医傑石 5個 | $0.99 | one-time |
| 医傑石 50個 | $9.99 | one-time |
| 医傑石 110個 | $19.99 | one-time |
| 医傑石 250個 | $39.99 | one-time |


## 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 医傑 free?

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

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

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

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

Boost.AI 英作文添削・共通テスト英語 ships an update every 4 days, and 医傑 every 9 days. Most recently, Boost.AI 英作文添削・共通テスト英語 was updated on October 20, 2026 and 医傑 on October 17, 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.*