# Grant TechBox vs The Ohms Law Calc

The clearest difference is in-app purchases: Grant TechBox at none against The Ohms Law Calc's 1. Grant TechBox also leads on iOS requirement (15.0 vs 17.6). The Ohms Law Calc's advantage is update cadence (every 2 months vs every 11 months). On price, ads and device support there is nothing between them.

Both are free to download. The Ohms Law Calc sells 1 one-off in-app purchase. Grant TechBox asks for nothing beyond the download.

Grant TechBox ships an update every 11 months, The Ohms Law Calc every 2 months. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Grant TechBox | The Ohms Law Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Size | 47 MB | 6 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GRANT ENGINEERING UK LTD](https://appshunter.io/developer/1042420331) | [1BIGRIG Ltd](https://appshunter.io/developer/1792073283) |

## What reviewers say

### Grant TechBox

[App page](https://appshunter.io/ios/app/grant-techbox/id1042420332)

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

**In-app purchases:** none


### The Ohms Law Calc

[App page](https://appshunter.io/ios/app/the-ohms-law-calc/id6747296194)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $19.99 | one-time |


## Frequently asked questions

### Is Grant TechBox free?

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

### Is The Ohms Law Calc free?

The Ohms Law Calc is free to download, with in-app purchases available.

### Do Grant TechBox or The Ohms Law Calc have ads?

Neither Grant TechBox nor The Ohms Law Calc shows ads.

### Which is updated more often, Grant TechBox or The Ohms Law Calc?

Grant TechBox ships an update every 11 months, and The Ohms Law Calc every 2 months. Most recently, Grant TechBox was updated on November 6, 2026 and The Ohms Law Calc on October 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.*