# Converter 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 Converter's 1. Engineering 單位流量換算 also leads on ads (none vs shown). Converter's advantage is iOS requirement (15.0 vs 17.6). On price, update cadence and device support there is nothing between them.

Both are free to download. Converter sells 1 one-off in-app purchase. Engineering 單位流量換算 asks for nothing beyond the download.

Converter ships an update every 3 months, Engineering 單位流量換算 every 2 months. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Converter | Engineering 單位流量換算 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 23 MB | 4 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CHI HOU LAM](https://appshunter.io/developer/1559222253) | [CHUNG-HSIEN YU](https://appshunter.io/developer/1872617732) |

## What reviewers say

### Converter

[App page](https://appshunter.io/ios/app/converter-common-units-convert/id1570015168)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertising | $0.99 | 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 Converter free?

Converter 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 Converter or Engineering 單位流量換算 have ads?

Converter shows ads; Engineering 單位流量換算 does not.

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

Converter ships an update every 3 months, and Engineering 單位流量換算 every 2 months. Most recently, Converter was updated on October 4, 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.*