# Boost.AI 英作文添削・共通テスト英語 vs Memora X 世界史一問一答

The clearest difference is ads: Boost.AI 英作文添削・共通テスト英語 at none against Memora X 世界史一問一答's shown. Boost.AI 英作文添削・共通テスト英語 also leads on review sentiment (90% vs 63%). On price, update cadence, in-app purchases and monetization model 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 Memora X 世界史一問一答 sells 1 one-off in-app purchase. 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, Memora X 世界史一問一答 every 5 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Boost.AI 英作文添削・共通テスト英語 | Memora X 世界史一問一答 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **90.5% of reviews** | 62.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 5 days |
| Monetization | Freemium | Free with in-app purchases |
| Size | 151 MB | 21 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) | [Issei Sato](https://appshunter.io/developer/6791698667) |

## 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 exams for the Common Test in English and get AI-powered essay feedback. Improve reading, listening, and writing skills with AI-driven corrections and explanations. Review vocabulary and grammar to prepare for university entrance exams and English proficiency tests.

**Highlights:** Common Test English past paper practice, AI essay correction and scoring, Reading and listening practice with audio, Vocabulary and grammar review, Handwritten answer input via photo, AI chat for clarification

**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 |


### Memora X 世界史一問一答

[App page](https://appshunter.io/ios/app/memora-x/id6807089001)

This app offers a comprehensive question-and-answer format for world history, covering 20 years of past exam questions. It features various learning modes, spaced repetition to combat forgetting, and a swipe-based interface for efficient study. Advanced features like "論述カットイン" and "my単語帳" are available with premium subscriptions.

**Highlights:** 20 years of past exam questions, 4,853 Q&A, 250 year questions, 477 essay questions, Three difficulty levels, Four learning approaches: horizontal, vertical, chronological, essay, Spaced repetition for optimal recall, Swipe interface for quick answers, Bookmark and create custom vocabulary lists

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プラチナMAX会員（買い切り） | $5.99 | 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 Memora X 世界史一問一答 free?

Memora X 世界史一問一答 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 Memora X 世界史一問一答 have ads?

Memora X 世界史一問一答 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 Memora X 世界史一問一答?

Boost.AI 英作文添削・共通テスト英語 ships an update every 4 days, and Memora X 世界史一問一答 every 5 days. Most recently, Boost.AI 英作文添削・共通テスト英語 was updated on October 30, 2026 and Memora X 世界史一問一答 on October 31, 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.*