# Solar Guardian vs Sunster

The clearest difference is rating: Sunster at 3.0 against Solar Guardian's 2.3. Sunster also leads on review sentiment (50% vs 17%) and update cadence (every 2 weeks vs every 2 months). Solar Guardian's advantage is ratings volume (17 vs 4). On price, ads, in-app purchases and monetization model 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 2.3. Both are backed by a comparable volume of ratings — 17 and 4 respectively. Written reviews point the same way: 17% of Solar Guardian's written reviews are positive against 50% of Sunster's.

Solar Guardian ships an update every 2 months, Sunster every 2 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Solar Guardian | Sunster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (17 ratings)](https://appshunter.io/ios/app/solar-guardian/id6443552259/reviews) | **[3.0 (4 ratings)](https://appshunter.io/ios/app/sunster/id6745934134/reviews)** |
| Number of ratings | **17** | 4 |
| Positive reviews | 16.7% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 85 MB | 58 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [BEIJING EPSOLAR TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1330876646) | [江苏百易德电子科技有限公司](https://appshunter.io/developer/1812800118) |

## What reviewers say

### Solar Guardian

[App page](https://appshunter.io/ios/app/solar-guardian/id6443552259)

Monitor and configure various solar energy systems, including inverters and storage solutions. This utility app provides essential data display and parameter adjustments for efficient energy management.

**Highlights:** Data display for solar systems, Parameter setting for inverters, Supports grid-tie and hybrid inverters, Manages energy storage systems, Configures N+1 hybrid systems, Monitors home and mobile energy storage

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

**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 Solar Guardian free?

Solar Guardian 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, Solar Guardian or Sunster?

Sunster is rated higher. Solar Guardian averages 2.3 out of 5 from 17 ratings, while Sunster averages 3.0 from 4 ratings.

### Do Solar Guardian or Sunster have ads?

Neither Solar Guardian nor Sunster shows ads.

### Which is updated more often, Solar Guardian or Sunster?

Solar Guardian ships an update every 2 months, and Sunster every 2 weeks. Most recently, Solar Guardian was updated on November 3, 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.*