# 掌上RefComp vs HVAC Smart

The clearest difference is device support: HVAC Smart at 3 against 掌上RefComp's —. 掌上RefComp's advantage is iOS requirement (12.0 vs 15.6). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 掌上RefComp | HVAC Smart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | — | Every 9 months |
| Size | 21 MB | 26 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Fujian Snowman Zhenxun Development Co., Ltd.](https://appshunter.io/developer/1480495955) | [ZHUHAI VDATA TECHNOLOGY CO., LTD](https://appshunter.io/developer/1239657281) |

## What reviewers say

### 掌上RefComp

[App page](https://appshunter.io/ios/app/refcomp/id1335909835)

**In-app purchases:** none


### HVAC Smart

[App page](https://appshunter.io/ios/app/hvac-smart/id1511650678)

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

**In-app purchases:** none


## Frequently asked questions

### Is 掌上RefComp free?

掌上RefComp is free to download, with no in-app purchases.

### Is HVAC Smart free?

HVAC Smart is free to download, with no in-app purchases.

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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.*