# Hardness Conversion Master vs 猫眼精灵

The clearest difference is in-app purchases: 猫眼精灵 at none against Hardness Conversion Master's 1. 猫眼精灵 also leads on iOS requirement (15.6 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Hardness Conversion Master sells 1 one-off in-app purchase. 猫眼精灵 asks for nothing beyond the download.

## The numbers

| Metric | Hardness Conversion Master | 猫眼精灵 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 days | — |
| Size | 259 MB | 28 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [POYU WANG](https://appshunter.io/developer/1883764660) | [梅莲 张](https://appshunter.io/developer/6790239667) |

## What reviewers say

### 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 |


### 猫眼精灵

[App page](https://appshunter.io/ios/app/id6796295099)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hardness Conversion Master free?

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

### Is 猫眼精灵 free?

猫眼精灵 is free to download, with no in-app purchases.

### Do Hardness Conversion Master or 猫眼精灵 have ads?

Both Hardness Conversion Master and 猫眼精灵 show ads.

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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.*