# Fourth Space vs Sunster

The clearest difference is review sentiment: Sunster at 50% against Fourth Space's 0%. Sunster also leads on rating (3.0 vs 1.0) and iOS requirement (13.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

Sunster holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews point the same way: 0% of Fourth Space's written reviews are positive against 50% of Sunster's.

Fourth Space ships an update fortnightly, Sunster every 2 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Fourth Space | Sunster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (3 ratings)](https://appshunter.io/ios/app/fourth-space/id6670521483/reviews) | **[3.0 (4 ratings)](https://appshunter.io/ios/app/sunster/id6745934134/reviews)** |
| Number of ratings | 3 | **4** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Free | Free |
| Size | 12 MB | 58 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 9+ | 17+ |
| Developer | [第肆空间(深圳)创新科技有限公司](https://appshunter.io/developer/1766639077) | [江苏百易德电子科技有限公司](https://appshunter.io/developer/1812800118) |

## What reviewers say

### Fourth Space

[App page](https://appshunter.io/ios/app/fourth-space/id6670521483)

Control your air conditioner remotely with this app. Adjust temperature, fan speed, mode, and power settings for a convenient smart home experience.

**Highlights:** Remote air conditioner control, Turn on/off AC, Adjust temperature, Set fan speed, Change operating mode

**Features:** macOS Compatibility

**In-app purchases:** none


### Sunster

[App page](https://appshunter.io/ios/app/sunster/id6745934134)

Control your RV's parking air conditioning and heater remotely from your mobile device. Manage multiple devices with customizable scenes and receive real-time safety notifications for peace of mind.

**Highlights:** Remote climate control, Multi-device compatibility, Customizable scene control, Real-time safety notifications, Encrypted data transmission, Dual-factor authentication

**In-app purchases:** none


## Frequently asked questions

### Is Fourth Space free?

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

### Is Sunster free?

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

### Which has better reviews, Fourth Space or Sunster?

Sunster is rated higher. Fourth Space averages 1.0 out of 5 from 3 ratings, while Sunster averages 3.0 from 4 ratings.

### Do Fourth Space or Sunster have ads?

Neither Fourth Space nor Sunster shows ads.

### Which is updated more often, Fourth Space or Sunster?

Fourth Space ships an update fortnightly, and Sunster every 2 weeks. Most recently, Fourth Space was updated on November 4, 2026 and Sunster on October 30, 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.*