Книги Библии на РЖЯ vs Power System Lab
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Книги Библии на РЖЯ
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The application is intended for deaf and hearing impaired people who speak the Russian Sign Language (RSL) and are interested in getting a deeper acquaintance with the Scriptures and studying it, as well as for hearing people, wanting to immerse themselves in the biblical text in sign language. This online application includes video clips with the translation of books of the New Testament and the Old Testament into the RSL, illustrated with graphical drawings of biblical realities and plots changing in the background, as well as maps of the places where the events described took place. The videos are supplemented with subtitles (that can be switched on), based on the reverse translation from the RSL, which has been drafted to help the perception of new concepts in translation, and enable you to compare the narrative story with the written text. Under the video is also the gospel text of two other translations to choose from (Synodal or modern), in which there are links to a dictionary with video explanations of key biblical concepts.
Power System Lab
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.
- Interactive marine electrical simulations
- Virtual instruments and diagnostic tools
- Four educational games
- Electrical calculation tools
- Customizable learning environment
- Progress tracking and account sync
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Power System Lab brings marine electrical learning, hands-on simulations and practical tools to cadets, electro-technical officers and anyone studying shipboard electrical systems on iPhone and iPad. Explore your learning island: follow explanations and activities, try virtual instruments and track your route. Change circuit parameters on virtual benches and compare the results. Investigate your training ship. Inspect marked components, collect findings and choose diagnostic actions. Work through repair and verification stages, explore equipment and prepare the vessel for a voyage. Four games bring variety to your practice: • Knowledge Tower: drop containers from a crane, keep the stack balanced and collect short facts. Compare your best runs in weekly and all-time player standings. There are no cash prizes. • Name the equipment: 250 photographs covering 45 types of equipment, components and tools. Choose one of four answers, learn its purpose, zoom into the image and revisit mistakes. Progress syncs with your account. • Match-three: component combinations, electrical effects and short facts about electricity and marine systems. • Crosswords: marine and electrical terms, new ports and grid zoom. Russian and English puzzles keep separate saved letters and progress. Keep useful tools within reach: electrical calculations, 4–20 mA signal scaling, Pt100/Pt1000, resistor markings, Modbus register conversion and more. Search, save favorites and check formulas. Set up clocks for your ship, home and ports. English and Russian interface. Native layouts adapt to iPad rotation. Choose a character and uniform, adjust effects and animations, or study with gentle surf and distant gulls. There are no ads. The tower leaderboard lets you hide another player or report their name. All users need a subscription for the main features after sign-in. If Apple confirms introductory-offer eligibility, either plan starts with 3 free days. You must confirm the subscription through Apple immediately; registration alone does not start a trial. Only one introductory offer is available per Apple Account for the subscription group. Switching plans or creating another Power System Lab account does not provide another trial. If ineligible, the paid period starts immediately. After the trial, the subscription automatically renews at US$4.99 per month or US$39.99 per year in the US storefront unless canceled in time. Both plans provide the same access; the year is charged upfront. Apple shows your localized price and terms before confirmation. To avoid the first charge, cancel through Apple at least 24 hours before the trial ends. Remaining free days after cancellation are not guaranteed. Internet is needed for sign-in, subscription verification, new learning actions and sync. In iOS, calculations and clocks run locally after access is verified; their settings and favorites sync when connected. The subscription also covers the website for the same account. Purchases are made only through Apple inside iOS; there is no separate web payment. Restore Purchases, subscription management, support, legal documents and account deletion remain available without a purchase. Restore with the original Apple Account and Power System Lab account. Deleting the app or account does not cancel an Apple subscription. Apple handles refunds; mandatory consumer rights are preserved. For independent study. The app does not replace formal training, equipment documentation or vessel procedures and does not provide professional certification. Support: support@powersystemlab.net Privacy: https://powersystemlab.net/legal/privacy?lang=en Terms: https://powersystemlab.net/legal/terms?lang=en Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Книги Библии на РЖЯ | Power System Lab |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.0 (3 ratings) — better |
| Positive reviews | — | 66.7% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 5 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 158 MB | 256 MB |
| Age rating | 4+ | 12+ |
| Developer | Институт перевода Библии | Serhii Zai |
In-app purchases
Книги Библии на РЖЯ
No in-app purchases
Power System Lab
No in-app purchases
Questions
Is Книги Библии на РЖЯ free?
Is Power System Lab free?
Do Книги Библии на РЖЯ or Power System Lab have ads?
Which is updated more often, Книги Библии на РЖЯ or Power System Lab?
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