# 答案之书 vs Number Riddle

The clearest difference is review sentiment: Number Riddle at 67% against 答案之书's 17%. Number Riddle also leads on in-app purchases (none vs 1) and ads (none vs shown). 答案之书's advantage is price (Free vs $0.99). On device support and iOS requirement there is nothing between them.

答案之书 is free to download; Number Riddle costs $0.99 up front. 答案之书 sells 1 one-off in-app purchase. Number Riddle asks for nothing beyond the download.

答案之书 ships an update every 12 months, Number Riddle fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 答案之书 | Number Riddle |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | 16.7% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 12 months | **Fortnightly** |
| Monetization | — | Paid |
| Size | 6 MB | 7 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [唯墨科技](https://appshunter.io/developer/1240699340) | [坡 王](https://appshunter.io/developer/1551750977) |

## What reviewers say

### 答案之书

[App page](https://appshunter.io/ios/app/id1475703134)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解锁无限问题 | $0.99 | one-time |


### Number Riddle

[App page](https://appshunter.io/ios/app/number-riddle-crack-the-code/id6764214227)

A logic-based deduction game where you uncover a hidden 3-digit code using limited clues and precise feedback. It offers quick gameplay sessions perfect for brain training and challenging your reasoning skills.

**Highlights:** Classic logic-based gameplay, Quick play sessions, Clear feedback system, Multiple difficulty levels, Level Mode, Daily Challenge

**In-app purchases:** none


## Frequently asked questions

### Is 答案之书 free?

答案之书 is free to download, with in-app purchases available.

### Is Number Riddle free?

Number Riddle costs $0.99, with no in-app purchases.

### Do 答案之书 or Number Riddle have ads?

答案之书 shows ads; Number Riddle does not.

### Which is updated more often, 答案之书 or Number Riddle?

答案之书 ships an update every 12 months, and Number Riddle fortnightly. Most recently, 答案之书 was updated on October 24, 2026 and Number Riddle on October 25, 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.*