# 网络预付费 vs Hardness Conversion Master

The clearest difference is in-app purchases: 网络预付费 at none against Hardness Conversion Master's 1. 网络预付费 also leads on ads (none vs shown) and iOS requirement (11.0 vs 17.6). Hardness Conversion Master's advantage is update cadence (every 3 days vs every 14 months). 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. 网络预付费 asks for nothing beyond the download.

网络预付费 ships an update every 14 months, Hardness Conversion Master every 3 days. The most recent releases landed on September 10, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | 网络预付费 | Hardness Conversion Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 14 months | **Every 3 days** |
| Size | 18 MB | 259 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [珠海派诺科技股份有限公司](https://appshunter.io/developer/1019412314) | [POYU WANG](https://appshunter.io/developer/1883764660) |

## What reviewers say

### 网络预付费

[App page](https://appshunter.io/ios/app/id1519980987)

**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 网络预付费 free?

网络预付费 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 网络预付费 or Hardness Conversion Master have ads?

Hardness Conversion Master shows ads; 网络预付费 does not.

### Which is updated more often, 网络预付费 or Hardness Conversion Master?

网络预付费 ships an update every 14 months, and Hardness Conversion Master every 3 days. Most recently, 网络预付费 was updated on September 10, 2026 and Hardness Conversion Master on August 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.*