# Boost.AI 英作文添削・共通テスト英語 vs ラクニマロ＠英熟語・イディオム暗記アプリ

The clearest difference is in-app purchases: ラクニマロ＠英熟語・イディオム暗記アプリ 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 ads (none vs shown). On price, update cadence, device support and iOS requirement 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. ラクニマロ＠英熟語・イディオム暗記アプリ 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, ラクニマロ＠英熟語・イディオム暗記アプリ weekly. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Boost.AI 英作文添削・共通テスト英語 | ラクニマロ＠英熟語・イディオム暗記アプリ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | Freemium | — |
| Size | 151 MB | 51 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ATSUSHI KIMURA](https://appshunter.io/developer/1829870349) | [Kasanimaro](https://appshunter.io/developer/1846987954) |

## 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 |


### ラクニマロ＠英熟語・イディオム暗記アプリ

[App page](https://appshunter.io/ios/app/id6756572705)

**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 ラクニマロ＠英熟語・イディオム暗記アプリ free?

ラクニマロ＠英熟語・イディオム暗記アプリ 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 ラクニマロ＠英熟語・イディオム暗記アプリ have ads?

ラクニマロ＠英熟語・イディオム暗記アプリ shows ads; Boost.AI 英作文添削・共通テスト英語 does not.

### Which is updated more often, Boost.AI 英作文添削・共通テスト英語 or ラクニマロ＠英熟語・イディオム暗記アプリ?

Boost.AI 英作文添削・共通テスト英語 ships an update every 4 days, and ラクニマロ＠英熟語・イディオム暗記アプリ weekly. Most recently, Boost.AI 英作文添削・共通テスト英語 was updated on October 28, 2026 and ラクニマロ＠英熟語・イディオム暗記アプリ on October 24, 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.*