# 工程师e家 vs HVAC PT Chart Toolkit

The clearest difference is price: 工程师e家 at Free against HVAC PT Chart Toolkit's $3.99. 工程师e家 also leads on iOS requirement (13.0 vs 17.6). HVAC PT Chart Toolkit's advantage is in-app purchases (none vs 3) and ads (none vs shown). On device support there is nothing between them.

工程师e家 is free to download; HVAC PT Chart Toolkit costs $3.99 up front. 工程师e家 sells 3 one-off in-app purchases. HVAC PT Chart Toolkit asks for nothing beyond the download.

## The numbers

| Metric | 工程师e家 | HVAC PT Chart Toolkit |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | — |
| Size | 61 MB | 3 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jinan Tailing Automation Technology Co., Ltd.](https://appshunter.io/developer/1618634520) | [润强 何](https://appshunter.io/developer/1821337209) |

## What reviewers say

### 工程师e家

[App page](https://appshunter.io/ios/app/e/id1641033041)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 资料年会员 | $3.99 | one-time |
| 资料永久会员 | $12.99 | one-time |
| 视频永久会员 | $39.99 | one-time |


### HVAC PT Chart Toolkit

[App page](https://appshunter.io/ios/app/hvac-pt-chart-toolkit/id6770447697)

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

**In-app purchases:** none


## Frequently asked questions

### Is 工程师e家 free?

工程师e家 is free to download, with in-app purchases available.

### Is HVAC PT Chart Toolkit free?

HVAC PT Chart Toolkit costs $3.99, with no in-app purchases.

### Do 工程师e家 or HVAC PT Chart Toolkit have ads?

工程师e家 shows ads; HVAC PT Chart Toolkit does not.

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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.*