# 21K School vs Промышленная безопасность 2026

The clearest difference is in-app purchases: 21K School at none against Промышленная безопасность 2026's 3. 21K School also leads on ads (none vs shown) and iOS requirement (13.3 vs 16.0). Промышленная безопасность 2026's advantage is update cadence (every 3 months vs every 27 months). On price and device support there is nothing between them.

Both are free to download. Промышленная безопасность 2026 sells 3 in-app purchases, starting at $2.99 per month. 21K School asks for nothing beyond the download.

21K School ships an update every 27 months, Промышленная безопасность 2026 every 3 months. The most recent releases landed on December 3, 2025 and October 21, 2026 respectively.

## The numbers

| Metric | 21K School | Промышленная безопасность 2026 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (48 ratings)](https://appshunter.io/ios/app/2026/id1619674480/reviews)** |
| Number of ratings | — | **48** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 27 months | **Every 3 months** |
| Monetization | — | Free with in-app purchases |
| Size | 96 MB | 67 MB |
| Requires iOS | **13.3** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Mindreflex Technologies Private Limited](https://appshunter.io/developer/1600971335) | [Aleksandr Alekseev](https://appshunter.io/developer/1227414052) |

## What reviewers say

### 21K School

[App page](https://appshunter.io/ios/app/21k-school/id1619098640)

**Features:** macOS Compatibility

**In-app purchases:** none


### Промышленная безопасность 2026

[App page](https://appshunter.io/ios/app/2026/id1619674480)

Prepare for industrial and energy safety exams with practice questions aligned with official requirements. Test yourself across various categories, including general safety, specialized areas, and energy security. Track your progress and focus on weak areas with dedicated modes.

**Highlights:** Comprehensive question banks, Category-specific testing, Timed 'Marathon' mode, Review 'My Mistakes', Exam simulation mode, Question search functionality, Individual statistics

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Промбезопасность - 1 месяц | $2.99 | per month |
| Пром безопасность - 3 месяца | $5.99 | per 3 months |
| Промышленная безопасность: год | $9.99 | per year |


## Frequently asked questions

### Is 21K School free?

21K School is free to download, with no in-app purchases.

### Is Промышленная безопасность 2026 free?

Промышленная безопасность 2026 is free to download, with in-app purchases available.

### Do 21K School or Промышленная безопасность 2026 have ads?

Промышленная безопасность 2026 shows ads; 21K School does not.

### Which is updated more often, 21K School or Промышленная безопасность 2026?

21K School ships an update every 27 months, and Промышленная безопасность 2026 every 3 months. Most recently, 21K School was updated on December 3, 2025 and Промышленная безопасность 2026 on October 21, 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.*