# Hardness Unit Converter vs AshtonBOX

The clearest difference is price: AshtonBOX at Free against Hardness Unit Converter's $1.99. AshtonBOX also leads on update cadence (every 3 weeks vs every 5 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

AshtonBOX 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.

Hardness Unit Converter ships an update every 5 months, AshtonBOX every 3 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Hardness Unit Converter | AshtonBOX |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.0 (7 ratings)](https://appshunter.io/ios/app/hardness-unit-converter/id1409248484/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 1 MB | 251 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kei Suefuji](https://appshunter.io/developer/1388335881) | [Flydiagram](https://appshunter.io/developer/1516995661) |

## What reviewers say

### 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


### AshtonBOX

[App page](https://appshunter.io/ios/app/ashtonbox/id1537525072)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hardness Unit Converter free?

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

### Is AshtonBOX free?

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

### Do Hardness Unit Converter or AshtonBOX have ads?

Neither Hardness Unit Converter nor AshtonBOX shows ads.

### Which is updated more often, Hardness Unit Converter or AshtonBOX?

Hardness Unit Converter ships an update every 5 months, and AshtonBOX every 3 weeks. Most recently, Hardness Unit Converter was updated on October 26, 2026 and AshtonBOX on October 27, 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.*