# 情報の王様 vs Def Init

The clearest difference is in-app purchases: Def Init at none against 情報の王様's 3. Def Init also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 情報の王様 sells 3 in-app purchases, starting at $1.99 per month. Def Init asks for nothing beyond the download.

情報の王様 ships an update every 6 weeks, Def Init every 3 weeks. The most recent releases landed on August 4, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | 情報の王様 | Def Init |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 138 MB | 33 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HANAUTA INC.](https://appshunter.io/developer/492009717) | [DeMiA](https://appshunter.io/developer/1541788198) |

## What reviewers say

### 情報の王様

[App page](https://appshunter.io/ios/app/1/id6467608924)

Master high school information studies with this quiz-style app. It offers over 1000 questions in Q&A and multiple-choice formats, perfect for quick study sessions, exam preparation, and reinforcing key concepts. Enjoy a game-like experience with rewards for clearing stages.

**Highlights:** Over 1000 Q&A and multiple-choice questions, Short play sessions for flexible study, Covers high school and university exam material, Game-like progression with stage clearing, Gift rewards for completing quests, Efficient memorization of key points

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 特訓プラン | $1.99 | per month |
| 特訓プラン | $11.99 | per 6 months |
| 特訓プラン | $19.99 | per year |


### Def Init

[App page](https://appshunter.io/ios/app/def-init/id6746444302)

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

**In-app purchases:** none


## Frequently asked questions

### Is 情報の王様 free?

情報の王様 is free to download, with in-app purchases available.

### Is Def Init free?

Def Init is free to download, with no in-app purchases.

### Do 情報の王様 or Def Init have ads?

情報の王様 shows ads; Def Init does not.

### Which is updated more often, 情報の王様 or Def Init?

情報の王様 ships an update every 6 weeks, and Def Init every 3 weeks. Most recently, 情報の王様 was updated on August 4, 2026 and Def Init on September 14, 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.*