# HYDROS App vs MOAI®

The clearest difference is update cadence: HYDROS App at every 3 months against MOAI®'s every 10 months. MOAI®'s advantage is iOS requirement (9.0 vs 15.6). 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.

HYDROS App ships an update every 3 months, MOAI® every 10 months. The most recent releases landed on October 18, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | HYDROS App | MOAI® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (22 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews)** | — |
| Number of ratings | **22** | — |
| Positive reviews | 62.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 10 months |
| Monetization | Free | — |
| Size | 70 MB | 51 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Coralvue](https://appshunter.io/developer/1455344293) | [SZ MOAI TECHNOLOGY CO., LTD](https://appshunter.io/developer/1649077706) |

## 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


### MOAI®

[App page](https://appshunter.io/ios/app/moai/id6443755461)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HYDROS App free?

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

### Is MOAI® free?

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

### Do HYDROS App or MOAI® have ads?

Neither HYDROS App nor MOAI® shows ads.

### Which is updated more often, HYDROS App or MOAI®?

HYDROS App ships an update every 3 months, and MOAI® every 10 months. Most recently, HYDROS App was updated on October 18, 2026 and MOAI® on October 1, 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.*