# Tools for hardness testing vs Hardness Conversion Master

The clearest difference is in-app purchases: Tools for hardness testing at none against Hardness Conversion Master's 1. Tools for hardness testing also leads on ads (none vs shown) and iOS requirement (8.0 vs 17.6). Hardness Conversion Master's advantage is update cadence (every 3 days vs every 5 weeks). On price and device support there is nothing between them.

Both are free to download. Hardness Conversion Master sells 1 one-off in-app purchase. Tools for hardness testing asks for nothing beyond the download.

Tools for hardness testing ships an update every 5 weeks, Hardness Conversion Master every 3 days. The most recent releases landed on October 26, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Tools for hardness testing | Hardness Conversion Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 3 days** |
| Size | 12 MB | 259 MB |
| Requires iOS | **8.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Groenewold - IT Solutions GmbH](https://appshunter.io/developer/1685262562) | [POYU WANG](https://appshunter.io/developer/1883764660) |

## 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 Conversion Master

[App page](https://appshunter.io/ios/app/hardness-conversion-master/id6760411989)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | $1.99 | one-time |


## Frequently asked questions

### Is Tools for hardness testing free?

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

### Is Hardness Conversion Master free?

Hardness Conversion Master is free to download, with in-app purchases available.

### Do Tools for hardness testing or Hardness Conversion Master have ads?

Hardness Conversion Master shows ads; Tools for hardness testing does not.

### Which is updated more often, Tools for hardness testing or Hardness Conversion Master?

Tools for hardness testing ships an update every 5 weeks, and Hardness Conversion Master every 3 days. Most recently, Tools for hardness testing was updated on October 26, 2026 and Hardness Conversion Master on October 31, 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.*