# Tools for hardness testing vs Pressure Units Converter

The clearest difference is price: Tools for hardness testing at Free against Pressure Units Converter's $1.99. Tools for hardness testing also leads on update cadence (every 5 weeks vs every 16 months) and iOS requirement (8.0 vs 12.0). On ads, in-app purchases and device support there is nothing between them.

Tools for hardness testing is free to download; Pressure Units Converter costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Tools for hardness testing ships an update every 5 weeks, Pressure Units Converter every 16 months. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Tools for hardness testing | Pressure Units Converter |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 16 months |
| Size | 12 MB | 8 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Groenewold - IT Solutions GmbH](https://appshunter.io/developer/1685262562) | [Kei Suefuji](https://appshunter.io/developer/1388335881) |

## What reviewers say

### Tools for hardness testing

[App page](https://appshunter.io/ios/app/tools-for-hardness-testing/id1029022869)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pressure Units Converter

[App page](https://appshunter.io/ios/app/pressure-units-converter/id1452151266)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tools for hardness testing free?

Tools for hardness testing is free to download, with no in-app purchases.

### Is Pressure Units Converter free?

Pressure Units Converter costs $1.99, with no in-app purchases.

### Do Tools for hardness testing or Pressure Units Converter have ads?

Neither Tools for hardness testing nor Pressure Units Converter shows ads.

### Which is updated more often, Tools for hardness testing or Pressure Units Converter?

Tools for hardness testing ships an update every 5 weeks, and Pressure Units Converter every 16 months. Most recently, Tools for hardness testing was updated on October 26, 2026 and Pressure Units Converter on October 25, 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.*