Fourth Space vs Sunster
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fourth Space
Control your air conditioner remotely with this app. Adjust temperature, fan speed, mode, and power settings for a convenient smart home experience.
- Remote air conditioner control
- Turn on/off AC
- Adjust temperature
- Set fan speed
- Change operating mode
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Use the Fourth Space APP to provide you with a convenient smart control experience. Through the APP, you can directly remotely control the air conditioner to turn on or off, and adjust the air conditioner's functions, wind speed, mode, temperature and other settings
Sunster
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.
- Remote climate control
- Multi-device compatibility
- Customizable scene control
- Real-time safety notifications
- Encrypted data transmission
- Dual-factor authentication
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Remote Smart Control No matter where you are, simply open the mobile app to remotely turn on/off and adjust the parking air conditioning temperature, control the heater operating mode, and say goodbye to extreme cold and heat by creating a comfortable environment in your RV. Multi-Device Compatibility Management Supports one-click connection with multiple devices, centralized management of heater devices, and customizable scene-based control schemes to simplify complex operations. Unworrying Safety Protection Real-time push notifications for device anomalies (such as overheating or power loss), supports remote forced shutdown; encrypted data transmission + dual-factor authentication, safeguarding your privacy and device security.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Fourth Space | Sunster |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (3 ratings) | 3.0 (4 ratings) — better |
| Positive reviews | 0.0% of reviews | 50.0% of reviews — better |
| Number of ratings | 3 | 4 — better |
| Update frequency | Fortnightly — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 58 MB |
| Age rating | 9+ | 17+ |
| Developer | 第肆空间(深圳)创新科技有限公司 | 江苏百易德电子科技有限公司 |
Customer experience
Fourth Space
Sunster
In-app purchases
Fourth Space
No in-app purchases
Sunster
No in-app purchases
