# 易匠 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 易匠's 3. 易匠's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 易匠 sells 3 one-off in-app purchases. Engineering 單位流量換算 asks for nothing beyond the download.

易匠 ships an update every 2 weeks, Engineering 單位流量換算 every 2 months. The most recent releases landed on October 8, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 易匠 | Engineering 單位流量換算 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 37 MB | 4 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yin Fu Cheung](https://appshunter.io/developer/1067857256) | [CHUNG-HSIEN YU](https://appshunter.io/developer/1872617732) |

## What reviewers say

### 易匠

[App page](https://appshunter.io/ios/app/id1067857257)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 奇門遁甲 | $22.99 | one-time |
| 京房六爻占卜 | $49.99 | one-time |
| 琴堂派太乙神數(三式之首) | $179.99 | 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 易匠 free?

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

Neither 易匠 nor Engineering 單位流量換算 shows ads.

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

易匠 ships an update every 2 weeks, and Engineering 單位流量換算 every 2 months. Most recently, 易匠 was updated on October 8, 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.*