# Промышленная безопасность Б2.1 vs Singularity Hub

The clearest difference is review sentiment: Singularity Hub at 100% against Промышленная безопасность Б2.1's 50%. Singularity Hub also leads on price (Free vs $1.99) and update cadence (every 4 weeks vs every 6 months). Промышленная безопасность Б2.1's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.0). On ads and in-app purchases there is nothing between them.

Singularity Hub is free to download; Промышленная безопасность Б2.1 costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Промышленная безопасность Б2.1 ships an update every 6 months, Singularity Hub every 4 weeks. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Промышленная безопасность Б2.1 | Singularity Hub |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 weeks** |
| Monetization | Paid | **Free** |
| Size | 14 MB | 48 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andrey Andreyev](https://appshunter.io/developer/1418253369) | [AGATON LIMITED](https://appshunter.io/developer/1602348451) |

## What reviewers say

### Промышленная безопасность Б2.1

[App page](https://appshunter.io/ios/app/21/id1528305009)

Prepare for certification exams in oil and gas industry operations with this comprehensive test simulator. It offers various training modes, including practice tests and an exam simulation, all offline.

**Highlights:** Test simulator for oil and gas operations, Offline access, Multiple training modes, Exam simulation, Error correction feature, Official test questions

**Features:** macOS Compatibility

**In-app purchases:** none


### Singularity Hub

[App page](https://appshunter.io/ios/app/singularity-hub/id6479359462)

Enhance your English skills with personalized word study and spaced repetition. This app uses modern algorithms and interactive lessons to help you memorize vocabulary effectively and become a confident speaker.

**Highlights:** Personalized word study, Spaced repetition algorithm, Interactive lessons, Vocabulary expansion, Anytime access

**In-app purchases:** none


## Frequently asked questions

### Is Промышленная безопасность Б2.1 free?

Промышленная безопасность Б2.1 costs $1.99, with no in-app purchases.

### Is Singularity Hub free?

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

### Do Промышленная безопасность Б2.1 or Singularity Hub have ads?

Neither Промышленная безопасность Б2.1 nor Singularity Hub shows ads.

### Which is updated more often, Промышленная безопасность Б2.1 or Singularity Hub?

Промышленная безопасность Б2.1 ships an update every 6 months, and Singularity Hub every 4 weeks. Most recently, Промышленная безопасность Б2.1 was updated on September 8, 2026 and Singularity Hub on September 10, 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.*