# MP3 Книги vs Тесты Ростехнадзора

The clearest difference is in-app purchases: MP3 Книги at none against Тесты Ростехнадзора's 10. MP3 Книги also leads on review sentiment (72% vs 46%) and ratings volume (43 vs 4). Тесты Ростехнадзора's advantage is iOS requirement (12.0 vs 15.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Тесты Ростехнадзора sells 10 one-off in-app purchases. MP3 Книги asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for MP3 Книги against 4.8 for Тесты Ростехнадзора. That said, the two scores are not equally well evidenced: MP3 Книги has 43 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 72% of MP3 Книги's written reviews are positive against 46% of Тесты Ростехнадзора's.

MP3 Книги ships an update every 10 days, Тесты Ростехнадзора weekly. Both last shipped on November 11, 2026.

## The numbers

| Metric | MP3 Книги | Тесты Ростехнадзора |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (43 ratings)](https://appshunter.io/ios/app/mp3/id1032988845/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/id1582418796/reviews)** |
| Number of ratings | **43** | 4 |
| Positive reviews | **72.1% of reviews** | 46.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 44 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KinKin Ltd](https://appshunter.io/developer/906102295) | [Andrey Andreyev](https://appshunter.io/developer/1418253369) |

## What reviewers say

### MP3 Книги

[App page](https://appshunter.io/ios/app/mp3/id1032988845)

Listen to your favorite audiobooks in MP3 or M4B format without conversion, completely free and without ads. Enjoy a user-friendly interface and elegant design. Add books via computer or cloud services like iCloud and Google Drive.

**Highlights:** Plays MP3 and M4B formats, No conversion needed, Completely free, No advertisements, Cloud service integration (iCloud, Google Drive), User-friendly interface, Elegant design

**Features:** macOS Compatibility

**In-app purchases:** none


### Тесты Ростехнадзора

[App page](https://appshunter.io/ios/app/id1582418796)

Prepare for industrial safety exams with this app. It offers practice tests covering all certification areas with answers. Features include study modes, error correction, and offline access for convenient preparation.

**Highlights:** Practice tests for industrial safety exams, Covers all certification areas (A.1 - B.12), Study modes: Preparation, Marathon, Exam, Error correction feature, Offline access, Quick search for questions

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Область Б.6.1 - ВСЕ ВОПРОСЫ | $0.99 | one-time |
| Область Б.8.2 - ВСЕ ВОПРОСЫ | $0.99 | one-time |
| Область Б.8.6 - ВСЕ ВОПРОСЫ | $0.99 | one-time |
| Область Б.8.3 - ВСЕ ВОПРОСЫ | $0.99 | one-time |
| Область Б.2.3 - ВСЕ ВОПРОСЫ | $1.99 | one-time |
| Промышленная безопасность 2023 | $1.99 | one-time |
| Область Б.2.1 - ВСЕ ВОПРОСЫ | $1.99 | one-time |
| Область Б.7.1 - ВСЕ ВОПРОСЫ | $1.99 | one-time |
| Промышленная безопасность А.1 | $1.99 | one-time |
| Область Б.9.3 - ВСЕ ВОПРОС | $1.99 | one-time |


## Frequently asked questions

### Is MP3 Книги free?

MP3 Книги is free to download, with no in-app purchases.

### Is Тесты Ростехнадзора free?

Тесты Ростехнадзора is free to download, with in-app purchases available.

### Which has better reviews, MP3 Книги or Тесты Ростехнадзора?

Тесты Ростехнадзора is rated higher. MP3 Книги averages 4.7 out of 5 from 43 ratings, while Тесты Ростехнадзора averages 4.8 from 4 ratings.

### Do MP3 Книги or Тесты Ростехнадзора have ads?

Neither MP3 Книги nor Тесты Ростехнадзора shows ads.

### Which is updated more often, MP3 Книги or Тесты Ростехнадзора?

MP3 Книги ships an update every 10 days, and Тесты Ростехнадзора weekly. Most recently, MP3 Книги was updated on November 11, 2026 and Тесты Ростехнадзора on November 11, 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.*