# Unit Converter All Categories vs Engineering 單位流量換算

The clearest difference is in-app purchases: Engineering 單位流量換算 at none against Unit Converter All Categories's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Unit Converter All Categories sells 3 in-app purchases, starting at $0.99 per month. Engineering 單位流量換算 asks for nothing beyond the download.

Unit Converter All Categories ships an update every 5 weeks, Engineering 單位流量換算 every 2 months. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Unit Converter All Categories | Engineering 單位流量換算 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 12 MB | 4 MB |
| Requires iOS | **16.6** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Vladislav Zhirnov](https://appshunter.io/developer/1476188065) | [CHUNG-HSIEN YU](https://appshunter.io/developer/1872617732) |

## What reviewers say

### Unit Converter All Categories

[App page](https://appshunter.io/ios/app/unit-converter-all-categories/id6747321259)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version / monthly | $0.99 | per month |
| Full version / year | $2.99 | per year |
| Remove ADS | $4.99 | one-time |


### Engineering 單位流量換算

[App page](https://appshunter.io/ios/app/engineering/id6758377219)

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter All Categories free?

Unit Converter All Categories is free to download, with in-app purchases available.

### Is Engineering 單位流量換算 free?

Engineering 單位流量換算 is free to download, with no in-app purchases.

### Do Unit Converter All Categories or Engineering 單位流量換算 have ads?

Neither Unit Converter All Categories nor Engineering 單位流量換算 shows ads.

### Which is updated more often, Unit Converter All Categories or Engineering 單位流量換算?

Unit Converter All Categories ships an update every 5 weeks, and Engineering 單位流量換算 every 2 months. Most recently, Unit Converter All Categories was updated on October 3, 2026 and Engineering 單位流量換算 on October 5, 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.*