kVA Calculator vs Universal Security Instruments
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
kVA Calculator
Easily calculate and convert electrical values like kVA, kW, Amps, Volts, and Power Factor. Supports both single and three-phase calculations for engineers working with power systems.
- Calculate kVA, kW, Amps, Volts, Power Factor
- Single Phase Calculations
- Three Phase Calculations
- Convert between electrical units
- Intuitive input for two values to find the third
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This kVA Calculator is the essential electrical calculator for electricians and engineers. Quickly convert or calculate kVA, kW and Power Factor or kVA, Volts and Amps — no more manual formula lookups. Perfect for converting kVA to Amps, or kW to KVA when sizing generators or UPS systems. Includes Single Phase and Three Phase, kW and kVA electrical calculations. Enter any two values to calculate the third. kVA Single Phase (1-Phase) Calculations: - Calculate kVA. - Calculate Volts. - Calculate Amps. kVA Three Phase (3-Phase) Calculations: - Calculate kVA. - Calculate Volts. - Calculate Amps. kVA, Power Factor & kW Calculations: - Calculate kVA. - Calculate Power Factor. - Calculate kW. Electrical units are measured in the following: Current (I) = Amps. Power (P) = Watts (or kW). Volts (V) = Voltage. Supports dark mode and 16 languages. Simple, fast, and accurate — the kVA calculator you'll reach for every day. Trusted by the professionals since 2011.
Universal Security Instruments
Manage and control your smart security and environmental devices remotely. This app offers a central hub for all your connected products, allowing for easy setup, monitoring, and sharing of device access with others.
- Remote device management
- Monitor devices globally
- Share device access
- Simple and secure setup
- Centralized hub for USI products
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Universal Security Instruments Control and manage your USI Smart devices from anywhere with this helpful app. Whether you are securing your home or managing your environment, our app provides a central hub for all your USI security and smart products. • Remote Management: Control and monitor your devices from anywhere in the world. • Seamless Sharing: Easily share device access among family members and friends to keep everyone connected and secure. • Simple & Secure Setup: Quickly and securely connect your new devices to your home network to get started in minutes.
Screenshots
Verdict
The clearest difference is rating: Universal Security Instruments at 5.0 against kVA Calculator's 4.4. Universal Security Instruments also leads on ads (none vs shown) and update cadence (every 2 months vs every 6 months). kVA Calculator's advantage is ratings volume (11 vs 1). On price, in-app purchases, device support and iOS requirement 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.
Universal Security Instruments holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: kVA Calculator has 11 ratings behind it against 1, so its average is the more settled of the two.
kVA Calculator ships an update every 6 months, Universal Security Instruments every 2 months. The most recent releases landed on August 24, 2026 and September 30, 2026 respectively.
| Parameter | kVA Calculator | Universal Security Instruments |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (11 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 41.7% of reviews | — |
| Number of ratings | 11 — better | 1 |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 200 MB |
| Age rating | 4+ | 12+ |
| Developer | Pro Certs Software Ltd | Feit Electric |
In-app purchases
kVA Calculator
No in-app purchases
Universal Security Instruments
No in-app purchases
Questions
Is kVA Calculator free?
Is Universal Security Instruments free?
Which has better reviews, kVA Calculator or Universal Security Instruments?
Do kVA Calculator or Universal Security Instruments have ads?
Which is updated more often, kVA Calculator or Universal Security Instruments?
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