# OhmsLab vs Voltage Calculator

The clearest difference is in-app purchases: Voltage Calculator at none against OhmsLab's 1. Voltage Calculator also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On price, update cadence and ads there is nothing between them.

Both are free to download. OhmsLab sells 1 one-off in-app purchase. Voltage Calculator asks for nothing beyond the download.

OhmsLab ships an update every 3 weeks, Voltage Calculator every 2 weeks. The most recent releases landed on October 11, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | OhmsLab | Voltage Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 3 MB | 72 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [InnovaLabWorks](https://appshunter.io/developer/1888514726) | [ESDEV Teknoloji](https://appshunter.io/developer/1693053468) |

## What reviewers say

### OhmsLab

[App page](https://appshunter.io/ios/app/ohmslab-ohms-law-and-codes/id6790220501)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OhmsLab Lifetime | $4.99 | one-time |


### Voltage Calculator

[App page](https://appshunter.io/ios/app/voltage-calculator/id6790529321)

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

**In-app purchases:** none


## Frequently asked questions

### Is OhmsLab free?

OhmsLab is free to download, with in-app purchases available.

### Is Voltage Calculator free?

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

### Do OhmsLab or Voltage Calculator have ads?

Neither OhmsLab nor Voltage Calculator shows ads.

### Which is updated more often, OhmsLab or Voltage Calculator?

OhmsLab ships an update every 3 weeks, and Voltage Calculator every 2 weeks. Most recently, OhmsLab was updated on October 11, 2026 and Voltage Calculator on October 19, 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.*