# Ohms Law vs Karpro

The clearest difference is ads: Karpro at none against Ohms Law's shown. Karpro also leads on update cadence (every 2 months vs every 16 months). 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.

Ohms Law ships an update every 16 months, Karpro every 2 months. The most recent releases landed on October 23, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Ohms Law | Karpro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (7 ratings)](https://appshunter.io/ios/app/ohms-law/id590727537/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 70.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 16 months | **Every 2 months** |
| Monetization | Ad-supported | — |
| Size | 12 MB | 79 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [深圳市卓联启航科技有限公司](https://appshunter.io/developer/1266211236) |

## What reviewers say

### Ohms Law

[App page](https://appshunter.io/ios/app/ohms-law/id590727537)

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.

**Highlights:** Calculate Voltage, Calculate Current, Calculate Resistance, Calculate Power, Input two values to find others

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

**In-app purchases:** none


### Karpro

[App page](https://appshunter.io/ios/app/karpro/id1514571789)

**In-app purchases:** none


## Frequently asked questions

### Is Ohms Law free?

Ohms Law is free to download, with no in-app purchases.

### Is Karpro free?

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

### Do Ohms Law or Karpro have ads?

Ohms Law shows ads; Karpro does not.

### Which is updated more often, Ohms Law or Karpro?

Ohms Law ships an update every 16 months, and Karpro every 2 months. Most recently, Ohms Law was updated on October 23, 2026 and Karpro on October 8, 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.*