# Einstein's secret book vs Intelligence Test

The clearest difference is update cadence: Einstein's secret book at every 3 weeks against Intelligence Test's every 5 months. Einstein's secret book also leads on review sentiment (44% vs 30%). Intelligence Test's advantage is ratings volume (18 vs 2). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Einstein's secret book sells 8 one-off in-app purchases and Intelligence Test sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.5 for Einstein's secret book against 4.6 for Intelligence Test. That said, the two scores are not equally well evidenced: Intelligence Test has 18 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 44% of Einstein's secret book's written reviews are positive against 30% of Intelligence Test's.

Einstein's secret book ships an update every 3 weeks, Intelligence Test every 5 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Einstein's secret book | Intelligence Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/einsteins-secret-book/id1457503679/reviews) | **[4.6 (18 ratings)](https://appshunter.io/ios/app/intelligence-test/id1470777147/reviews)** |
| Number of ratings | 2 | **18** |
| Positive reviews | **44.4% of reviews** | 30.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 93 MB | 56 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Godline Studios Sociedad Limitada](https://appshunter.io/developer/1057959906) | [Horea Bucerzan](https://appshunter.io/developer/1459301615) |

## What reviewers say

### Einstein's secret book

[App page](https://appshunter.io/ios/app/einsteins-secret-book/id1457503679)

Explore Albert Einstein's life and scientific achievements through an interactive book. Engage in various tests covering music, geography, the universe, and logic to challenge your knowledge and complete the book.

**Highlights:** Biography of Albert Einstein, Scientific achievements overview, Chapter-based learning, Knowledge-testing challenges, Logic and dexterity games, Multilingual support

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add live | $0.99 | one-time |
| Remove ads | $1.99 | one-time |
| Donate | $1.99 | one-time |
| Remove ads | $2.99 | one-time |
| Donate | $2.99 | one-time |
| Donate | $4.99 | one-time |
| Donate | $8.99 | one-time |
| Donate | $17.99 | one-time |


### Intelligence Test

[App page](https://appshunter.io/ios/app/intelligence-test/id1470777147)

Discover your IQ with a free intelligence test. Get instant results to see if you measure up to genius levels. This game offers a quick way to assess your cognitive abilities.

**Highlights:** Free intelligence test, Instant IQ score, Assess cognitive abilities, Suitable for all ages, Available on iOS devices

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extra Content + Ad-Free | $3.99 | one-time |


## Frequently asked questions

### Is Einstein's secret book free?

Einstein's secret book is free to download, with in-app purchases available.

### Is Intelligence Test free?

Intelligence Test is free to download, with in-app purchases available.

### Which has better reviews, Einstein's secret book or Intelligence Test?

Intelligence Test is rated higher. Einstein's secret book averages 4.5 out of 5 from 2 ratings, while Intelligence Test averages 4.6 from 18 ratings.

### Do Einstein's secret book or Intelligence Test have ads?

Neither Einstein's secret book nor Intelligence Test shows ads.

### Which is updated more often, Einstein's secret book or Intelligence Test?

Einstein's secret book ships an update every 3 weeks, and Intelligence Test every 5 months. Most recently, Einstein's secret book was updated on November 2, 2026 and Intelligence Test on November 3, 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.*