Power Calculator vs ROE Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Power Calculator
This app provides a straightforward calculator designed for the electrical industry, offering tools for power and lighting calculations. It helps users determine generator and UPS requirements, convert units, and calculate fuel consumption. Suitable for both professionals and casual users needing electrical calculations.
- KW, kVA, and Amps calculation
- Generator requirements calculation (single/three phase)
- UPS requirements calculation (single/three phase)
- Lumens and Watts conversion
- Generator fuel consumption calculation
- Generator power calculation
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A simple no fuss calculator for electrical industry professionals & casual users alike. Incorporates a range of electrical power & lighting calculators: • KW and kVA and Amps • Calculate generator requirements (single or three phase) • Calculate UPS requirements (single or three phase) • Convert Lumens & Watts • Generator Fuel Consumption • Generator Power Calculator
ROE Calculator
This application provides essential technical calculations for LED screens, including ballast, pixel, and power requirement analysis. It's designed to be the ultimate tool for LED technicians during on-site work and production preparation.
- Ballast calculation
- Pixel and resolution calculation
- Power requirement analysis
- Technical calculations for LED screens
- On-site and preparation tools
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ROE Visual is proud to announce the release of its groundbreaking ROE Calculator APP. This cutting-edge application is a complete upgrade of the previous ballast calculator and has added many new and exciting options to create essential technical calculations for your LED screens. With a comprehensive suite of tools that include ballast calculation, pixel and resolution calculation, power requirement analysis, and much more, the ROE Calculator APP will become the ultimate tool for LED technicians, whether on-site or in the preparation stages of production.
Screenshots
Verdict
The clearest difference is rating: Power Calculator at 4.5 against ROE Calculator's 4.0. ROE Calculator's advantage is review sentiment (100% vs 84%) and iOS requirement (15.1 vs 17.6). On price, ratings volume, update cadence and ads 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.
Power Calculator holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews complicate that: 84% of Power Calculator's written reviews are positive against 100% of ROE Calculator's, so the app with the better star average is not the one people write more warmly about.
Power Calculator ships an update every 2 months, ROE Calculator every 6 weeks. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.
| Parameter | Power Calculator | ROE Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | 4.0 (1 ratings) |
| Positive reviews | 84.2% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 2 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Power Continuity Limited | ROE Visual Co., Ltd |
Customer experience
Power Calculator
ROE Calculator
In-app purchases
Power Calculator
No in-app purchases
ROE Calculator
No in-app purchases
Questions
Is Power Calculator free?
Is ROE Calculator free?
Which has better reviews, Power Calculator or ROE Calculator?
Do Power Calculator or ROE Calculator have ads?
Which is updated more often, Power Calculator or ROE Calculator?
Other comparisons
