# kVA Calculator vs Universal Security Instruments

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 (12 vs 1). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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 12 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 October 14, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | kVA Calculator | Universal Security Instruments |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (12 ratings)](https://appshunter.io/ios/app/kva-calculator/id467407057/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/universal-security-instruments/id6756246978/reviews)** |
| Number of ratings | **12** | 1 |
| Positive reviews | 41.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Ad-supported | **Free** |
| Size | 10 MB | 200 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [Feit Electric](https://appshunter.io/developer/1022520207) |

## What reviewers say

### kVA Calculator

[App page](https://appshunter.io/ios/app/kva-calculator/id467407057)

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.

**Highlights:** 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

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

**In-app purchases:** none


### Universal Security Instruments

[App page](https://appshunter.io/ios/app/universal-security-instruments/id6756246978)

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.

**Highlights:** Remote device management, Monitor devices globally, Share device access, Simple and secure setup, Centralized hub for USI products

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is kVA Calculator free?

kVA Calculator is free to download, with no in-app purchases.

### Is Universal Security Instruments free?

Universal Security Instruments is free to download, with no in-app purchases.

### Which has better reviews, kVA Calculator or Universal Security Instruments?

Universal Security Instruments is rated higher. kVA Calculator averages 4.4 out of 5 from 12 ratings, while Universal Security Instruments averages 5.0 from 1 ratings.

### Do kVA Calculator or Universal Security Instruments have ads?

kVA Calculator shows ads; Universal Security Instruments does not.

### Which is updated more often, kVA Calculator or Universal Security Instruments?

kVA Calculator ships an update every 6 months, and Universal Security Instruments every 2 months. Most recently, kVA Calculator was updated on October 14, 2026 and Universal Security Instruments on September 30, 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.*