# Книги Библии на РЖЯ vs Power System Lab

The clearest difference is update cadence: Power System Lab at every 3 days against Книги Библии на РЖЯ's every 5 months. Книги Библии на РЖЯ's advantage is iOS requirement (15.6 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.

Книги Библии на РЖЯ ships an update every 5 months, Power System Lab every 3 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Книги Библии на РЖЯ | 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 | Every 5 months | **Every 3 days** |
| Monetization | — | Subscription |
| Size | 158 MB | 256 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Институт перевода Библии](https://appshunter.io/developer/1199819673) | [Serhii Zai](https://appshunter.io/developer/6814270425) |

## What reviewers say

### Книги Библии на РЖЯ

[App page](https://appshunter.io/ios/app/id1438206816)

**Features:** macOS Compatibility

**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 Книги Библии на РЖЯ free?

Книги Библии на РЖЯ 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 Книги Библии на РЖЯ or Power System Lab have ads?

Neither Книги Библии на РЖЯ nor Power System Lab shows ads.

### Which is updated more often, Книги Библии на РЖЯ or Power System Lab?

Книги Библии на РЖЯ ships an update every 5 months, and Power System Lab every 3 days. Most recently, Книги Библии на РЖЯ was updated on November 6, 2026 and Power System Lab 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.*