# Электробезопасность vs Ottor Mastar

The clearest difference is price: Ottor Mastar at Free against Электробезопасность's $1.99. Электробезопасность's advantage is iOS requirement (12.0 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Ottor Mastar is free to download; Электробезопасность costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Электробезопасность ships an update every 4 months, Ottor Mastar every 2 months. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Электробезопасность | Ottor Mastar |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 18 MB | 29 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 12+ |
| Developer | [Andrey Andreyev](https://appshunter.io/developer/1418253369) | [Albert Nikanorov](https://appshunter.io/developer/1870625344) |

## What reviewers say

### Электробезопасность

[App page](https://appshunter.io/ios/app/3/id1524368358)

Prepare for your electrical safety certification exam with this comprehensive test simulator. It offers various modes to study questions, practice without limits, and simulate the real exam experience. All content is available offline, ensuring you can study anytime, anywhere.

**Highlights:** Study questions in text format with correct answers, Unlimited practice mode (Marathon), Simulated exam mode, Error correction feature, Offline functionality, Multiple study modes

**Features:** macOS Compatibility

**In-app purchases:** none


### Ottor Mastar

[App page](https://appshunter.io/ios/app/ottor-mastar/id6789648576)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Электробезопасность free?

Электробезопасность costs $1.99, with no in-app purchases.

### Is Ottor Mastar free?

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

### Do Электробезопасность or Ottor Mastar have ads?

Neither Электробезопасность nor Ottor Mastar shows ads.

### Which is updated more often, Электробезопасность or Ottor Mastar?

Электробезопасность ships an update every 4 months, and Ottor Mastar every 2 months. Most recently, Электробезопасность was updated on October 29, 2026 and Ottor Mastar on October 31, 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.*