# Про.ОК vs Power System Lab

The clearest difference is update cadence: Power System Lab at every 3 days against Про.ОК's monthly. Про.ОК's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Про.ОК ships an update monthly, Power System Lab every 3 days. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Про.ОК | Power System Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (3 ratings)](https://appshunter.io/ios/app/power-system-lab/id6814270423/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | — | Subscription |
| Size | 36 MB | 256 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [Mikhail Goncharov](https://appshunter.io/developer/1825098847) | [Serhii Zai](https://appshunter.io/developer/6814270425) |

## What reviewers say

### Про.ОК

[App page](https://appshunter.io/ios/app/id6748306658)

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

**In-app purchases:** none


### Power System Lab

[App page](https://appshunter.io/ios/app/power-system-lab/id6814270423)

This app offers a comprehensive learning experience for marine electrical systems through interactive simulations, practical tools, and engaging games. It allows users to explore virtual environments, perform diagnostics, and test their knowledge with various challenges. The app also includes useful calculation tools and customization options.

**Highlights:** Interactive marine electrical simulations, Virtual instruments and diagnostic tools, Four educational games, Electrical calculation tools, Customizable learning environment, Progress tracking and account sync

**In-app purchases:** none


## Frequently asked questions

### Is Про.ОК free?

Про.ОК is free to download, with no in-app purchases.

### Is Power System Lab free?

Power System Lab is free to download, with no in-app purchases.

### Do Про.ОК or Power System Lab have ads?

Neither Про.ОК nor Power System Lab shows ads.

### Which is updated more often, Про.ОК or Power System Lab?

Про.ОК ships an update monthly, and Power System Lab every 3 days. Most recently, Про.ОК was updated on October 30, 2026 and Power System Lab on October 29, 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.*