# Temp & RH Platform vs Four

The clearest difference is update cadence: Four at every 2 months against Temp & RH Platform's every 13 months. Temp & RH Platform's advantage is iOS requirement (9.3 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Temp & RH Platform ships an update every 13 months, Four every 2 months. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Temp & RH Platform | Four |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Size | 14 MB | 58 MB |
| Requires iOS | **9.3** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [TZONE DIGITAL TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1129067230) | [Xiamen Sixin IoT Technology Co., Ltd.](https://appshunter.io/developer/1438611291) |

## What reviewers say

### Temp & RH Platform

[App page](https://appshunter.io/ios/app/temp-and-rh-platform/id1218203376)

**In-app purchases:** none


### Four

[App page](https://appshunter.io/ios/app/four-faith-sensor-cloud/id6451084198)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Temp & RH Platform free?

Temp & RH Platform is free to download, with no in-app purchases.

### Is Four free?

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

### Do Temp & RH Platform or Four have ads?

Neither Temp & RH Platform nor Four shows ads.

### Which is updated more often, Temp & RH Platform or Four?

Temp & RH Platform ships an update every 13 months, and Four every 2 months. Most recently, Temp & RH Platform was updated on October 15, 2026 and Four on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*