# IQ Challenge Book vs Dozen

The clearest difference is update cadence: Dozen at every 5 months against IQ Challenge Book's every 76 months. Dozen also leads on ratings volume (21 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for IQ Challenge Book against 4.9 for Dozen. That said, the two scores are not equally well evidenced: Dozen has 21 ratings behind it against 1, so its average is the more settled of the two.

IQ Challenge Book ships an update every 76 months, Dozen every 5 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | IQ Challenge Book | Dozen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/iq-challenge-book/id1320107027/reviews)** | [4.9 (21 ratings)](https://appshunter.io/ios/app/dozen-memory-game/id1520158240/reviews) |
| Number of ratings | 1 | **21** |
| Positive reviews | — | 96.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 76 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 1 MB | 29 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Adrian Minca](https://appshunter.io/developer/1224651577) | [Igor Fedorov](https://appshunter.io/developer/1520158242) |

## What reviewers say

### IQ Challenge Book

[App page](https://appshunter.io/ios/app/iq-challenge-book/id1320107027)

Assess your intelligence level with this application that provides an IQ score based on your answers to a series of questions. It categorizes your score according to a standard IQ scale, ranging from genius to feeble-mindedness. Test your limits and discover your intelligence quotient.

**Highlights:** IQ score determination, Intelligence level assessment, IQ score categorization, Test your limits, User-friendly interface

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

**In-app purchases:** none


### Dozen

[App page](https://appshunter.io/ios/app/dozen-memory-game/id1520158240)

A challenging memory card game where you compete against your iPhone to test and improve your memorization skills. Flip cards, match pairs, and score points before the device outmaneuvers you. Engage in fast-paced, addictive gameplay anytime, anywhere.

**Highlights:** Memory card game, Compete against iPhone, Memorize card locations, Score pairing points, Fast-paced gameplay, Sharpen memory

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IQ Challenge Book free?

IQ Challenge Book is free to download, with no in-app purchases.

### Is Dozen free?

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

### Which has better reviews, IQ Challenge Book or Dozen?

IQ Challenge Book is rated higher. IQ Challenge Book averages 5.0 out of 5 from 1 ratings, while Dozen averages 4.9 from 21 ratings.

### Do IQ Challenge Book or Dozen have ads?

Neither IQ Challenge Book nor Dozen shows ads.

### Which is updated more often, IQ Challenge Book or Dozen?

IQ Challenge Book ships an update every 76 months, and Dozen every 5 months. Most recently, IQ Challenge Book was updated on October 24, 2026 and Dozen 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.*