# 予習復習効率UP vs 化学の王様

The clearest difference is review sentiment: 化学の王様 at 42% against 予習復習効率UP's 5%. 化学の王様 also leads on update cadence (every 3 weeks vs every 3 months). 予習復習効率UP's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 化学の王様 sells 3 in-app purchases, starting at $3.49 per month. 予習復習効率UP asks for nothing beyond the download.

予習復習効率UP ships an update every 3 months, 化学の王様 every 3 weeks. The most recent releases landed on August 13, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 予習復習効率UP | 化学の王様 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id1519715518/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 5.0% of reviews | **42.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 561 MB | 139 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Benesse Corporation](https://appshunter.io/developer/381219440) | [HANAUTA INC.](https://appshunter.io/developer/492009717) |

## What reviewers say

### 予習復習効率UP

[App page](https://appshunter.io/ios/app/up/id1446247648)

This app aids high school students in preparing for and reviewing English, Math, and Japanese (Classical Japanese and Chinese Classics) lessons. It offers features like textbook page search, vocabulary lists, grammar explanations, and problem-solving guides.

**Highlights:** Textbook page search, Vocabulary and idiom lists, Grammar explanations and videos, Classical Japanese/Chinese Classics translation and parsing, Math problem search and formula lists, English dictionary by camera, Automated parsing for Classical Japanese

**In-app purchases:** none


### 化学の王様

[App page](https://appshunter.io/ios/app/id1519715518)

This app offers a fun, quiz-like approach to learning high school chemistry. It features over 3000 questions in various formats and is designed to help users memorize key concepts for exams. Users can progress through stages and earn rewards while studying.

**Highlights:** Over 3000 chemistry questions, Quiz-like learning format, Short play sessions, Exam preparation content, Game-like progression, Gift rewards for quests

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 合格プラン | $3.49 | per month |
| 合格プラン | $17.49 | per 6 months |
| 合格プラン | $27.99 | per year |


## Frequently asked questions

### Is 予習復習効率UP free?

予習復習効率UP is free to download, with no in-app purchases.

### Is 化学の王様 free?

化学の王様 is free to download, with in-app purchases available.

### Do 予習復習効率UP or 化学の王様 have ads?

化学の王様 shows ads; 予習復習効率UP does not.

### Which is updated more often, 予習復習効率UP or 化学の王様?

予習復習効率UP ships an update every 3 months, and 化学の王様 every 3 weeks. Most recently, 予習復習効率UP was updated on August 13, 2026 and 化学の王様 on October 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*