Ohms Law vs Universal Security Instruments
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ohms Law
This utility app calculates voltage, current, resistance, and power using Ohm's Law. Simply input any two values, and the app will compute the remaining two, providing a comprehensive tool for electrical calculations.
- Calculate Voltage
- Calculate Current
- Calculate Resistance
- Calculate Power
- Input two values to find others
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Ohms Law calculator for calculating power, current, resistance and voltage. Ohms Law Calculator Features: - Calculate Voltage (volts) - Calculate Current (amps) - Calculate Resistance (ohms) - Calculate Power (watts) Input any two values to calculate the other two. Ohms Law Formula: V = Voltage I = Current R = Resistance P = Power V / IxR (or P) An advanced Ohms Law calculator to calculate Voltage, Current, Resistance & Power. How to use: 1) Enter any two values to calculate the other two. 2) Tap calculate. A Voltage Calculator, Current, Resistance, Power calculator all in one app. Check out our collection of electrical apps for iPhone and iPad https://www.procertssoftware.com/apps/
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 Ohms Law's 4.3. Universal Security Instruments also leads on ads (none vs shown) and update cadence (every 2 months vs every 16 months). Ohms Law's advantage is ratings volume (7 vs 1) and iOS requirement (12.0 vs 14.0). On price, 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.
Universal Security Instruments holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Ohms Law has 7 ratings behind it against 1, so its average is the more settled of the two.
Ohms Law ships an update every 16 months, Universal Security Instruments every 2 months. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.
| Parameter | Ohms Law | Universal Security Instruments |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (7 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 70.0% of reviews | — |
| Number of ratings | 7 — better | 1 |
| Update frequency | Every 16 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 | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 12 MB | 200 MB |
| Age rating | 4+ | 12+ |
| Developer | Pro Certs Software Ltd | Feit Electric |
In-app purchases
Ohms Law
No in-app purchases
Universal Security Instruments
No in-app purchases
Questions
Is Ohms Law free?
Is Universal Security Instruments free?
Which has better reviews, Ohms Law or Universal Security Instruments?
Do Ohms Law or Universal Security Instruments have ads?
Which is updated more often, Ohms Law or Universal Security Instruments?
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