# Tools for hardness testing vs Hardness Unit Converter

The clearest difference is price: Tools for hardness testing at Free against Hardness Unit Converter's $1.99. Tools for hardness testing also leads on update cadence (every 5 weeks vs every 5 months) and iOS requirement (8.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

Tools for hardness testing is free to download; Hardness Unit 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, Hardness Unit Converter every 5 months. The most recent releases landed on October 7, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Tools for hardness testing | Hardness Unit Converter |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[4.0 (7 ratings)](https://appshunter.io/ios/app/hardness-unit-converter/id1409248484/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 5 months |
| Monetization | — | Paid |
| Size | 12 MB | 1 MB |
| Requires iOS | **8.0** | 15.6 |
| 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


### Hardness Unit Converter

[App page](https://appshunter.io/ios/app/hardness-unit-converter/id1409248484)

Easily convert hardness values between 12 different units, including Vickers, Brinell, Rockwell, and Shore. Input your value and select the desired unit for instant conversion, referencing ASTM E 140 standards and polynomial approximations for accuracy.

**Highlights:** Converts 12 hardness units, Vickers, Brinell, Rockwell, Shore support, Tensile strength conversion, ASTM E 140 reference, Polynomial approximation for data, Simple input and unit selection

**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 Hardness Unit Converter free?

Hardness Unit Converter costs $1.99, with no in-app purchases.

### Do Tools for hardness testing or Hardness Unit Converter have ads?

Neither Tools for hardness testing nor Hardness Unit Converter shows ads.

### Which is updated more often, Tools for hardness testing or Hardness Unit Converter?

Tools for hardness testing ships an update every 5 weeks, and Hardness Unit Converter every 5 months. Most recently, Tools for hardness testing was updated on October 7, 2026 and Hardness Unit Converter on September 29, 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.*