# HYDROS App vs Resun Smart

The clearest difference is review sentiment: HYDROS App at 62% against Resun Smart's 0%. HYDROS App also leads on update cadence (every 3 months vs every 10 months). Resun Smart's advantage is rating (4.5 vs 3.6). On price, ratings volume, ads 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.

Resun Smart holds the better App Store score, 4.5 against 3.6. Both are backed by a comparable volume of ratings — 23 and 24 respectively. Written reviews complicate that: 62% of HYDROS App's written reviews are positive against 0% of Resun Smart's, so the app with the better star average is not the one people write more warmly about.

HYDROS App ships an update every 3 months, Resun Smart every 10 months. The most recent releases landed on October 22, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | HYDROS App | Resun Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (23 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews) | **[4.5 (24 ratings)](https://appshunter.io/ios/app/resun-smart/id1564691703/reviews)** |
| Number of ratings | 23 | **24** |
| Positive reviews | **62.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 70 MB | 236 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Coralvue](https://appshunter.io/developer/1455344293) | [深圳兴日生实业有限公司/Shenzhen Xing Risheng Industrial Co.,Ltd](https://appshunter.io/developer/1363873279) |

## What reviewers say

### HYDROS App

[App page](https://appshunter.io/ios/app/hydros-app/id1455344294)

Easily monitor and control your aquarium's vital parameters like temperature, pH, and salinity. Manage all your connected devices, including ATOs, lights, and pumps, with a user-friendly interface. Quick setup with preset configurations means no coding is required to get your system running.

**Highlights:** Monitor temperature, ORP, pH, salinity, Control ATO, lights, heaters, pumps, User-friendly interface, Quick setup with presets, Manage multiple devices and aquariums, Set schedules and create modes

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

**In-app purchases:** none


### Resun Smart

[App page](https://appshunter.io/ios/app/resun-smart/id1564691703)

Control your smart devices remotely with this comprehensive application. It offers multiple connection methods, allows for group control, and supports automation based on various conditions. Share device access with family members and enjoy seamless updates.

**Highlights:** Remote smart device control, AP/SMART connection methods, Control multiple devices, Automated functions, Third-party voice access support, Device sharing, Group control, OTA software updates

**In-app purchases:** none


## Frequently asked questions

### Is HYDROS App free?

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

### Is Resun Smart free?

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

### Which has better reviews, HYDROS App or Resun Smart?

Resun Smart is rated higher. HYDROS App averages 3.6 out of 5 from 23 ratings, while Resun Smart averages 4.5 from 24 ratings.

### Do HYDROS App or Resun Smart have ads?

Neither HYDROS App nor Resun Smart shows ads.

### Which is updated more often, HYDROS App or Resun Smart?

HYDROS App ships an update every 3 months, and Resun Smart every 10 months. Most recently, HYDROS App was updated on October 22, 2026 and Resun Smart on October 25, 2026.

---

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