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

The clearest difference is review sentiment: Boost.AI 英作文添削・共通テスト英語 at 90% against Memora X 日本史一問一答's 54%. Boost.AI 英作文添削・共通テスト英語 also leads on ads (none vs shown). 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 日本史一問一答 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 30, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Boost.AI 英作文添削・共通テスト英語 | Memora X 日本史一問一答 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **90.5% of reviews** | 53.8% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | Freemium | Free with in-app purchases |
| Size | 151 MB | 22 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 日本史一問一答

[App page](https://appshunter.io/ios/app/memora-x/id6807089373)

This app offers a comprehensive Japanese history quiz experience for university entrance exams. It covers 20 years of past exam questions, allowing users to learn terms, dates, and essay topics. Features include spaced repetition, customizable difficulty, and progress tracking to aid memorization.

**Highlights:** 20 years of past exam questions, 4,305 quiz questions per year, Spaced repetition learning, Adjustable difficulty levels, Essay question practice, Customizable 'my wordbook'

**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 日本史一問一答 free?

Memora X 日本史一問一答 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 日本史一問一答 have ads?

Memora X 日本史一問一答 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 日本史一問一答?

Boost.AI 英作文添削・共通テスト英語 ships an update every 4 days, and Memora X 日本史一問一答 every 4 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 日本史一問一答 on November 1, 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.*