# IQ Challenge Book vs Enigma

The clearest difference is update cadence: Enigma at every 3 months against IQ Challenge Book's every 76 months. Enigma also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

IQ Challenge Book ships an update every 76 months, Enigma every 3 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | IQ Challenge Book | Enigma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/iq-challenge-book/id1320107027/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 76 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 1 MB | 466 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Adrian Minca](https://appshunter.io/developer/1224651577) | [Corey Clark](https://appshunter.io/developer/1578949040) |

## 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


### Enigma

[App page](https://appshunter.io/ios/app/enigma-essentials-i/id6504303873)

**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 Enigma free?

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

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

Neither IQ Challenge Book nor Enigma shows ads.

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

IQ Challenge Book ships an update every 76 months, and Enigma every 3 months. Most recently, IQ Challenge Book was updated on October 24, 2026 and Enigma 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.*