# HYDROS App vs AQN Link

The clearest difference is update cadence: AQN Link at every 9 days against HYDROS App's every 3 months. HYDROS App's advantage is review sentiment (62% vs 33%). 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.

HYDROS App ships an update every 3 months, AQN Link every 9 days. The most recent releases landed on November 2, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | HYDROS App | AQN Link |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (24 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | **62.3% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Free | Free |
| Size | 70 MB | 43 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Coralvue](https://appshunter.io/developer/1455344293) | [烽城 熊](https://appshunter.io/developer/1273528137) |

## 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


### AQN Link

[App page](https://appshunter.io/ios/app/aqn-link/id6449433834)

This platform offers a streamlined and intelligent way to connect and manage your products. It redefines product interaction, providing a user-friendly experience for controlling various devices.

**Highlights:** Innovative control platform, Streamlined product connection, Intelligent device functioning, Simple user interface, Smart control application

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

**In-app purchases:** none


## Frequently asked questions

### Is HYDROS App free?

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

### Is AQN Link free?

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

### Do HYDROS App or AQN Link have ads?

Neither HYDROS App nor AQN Link shows ads.

### Which is updated more often, HYDROS App or AQN Link?

HYDROS App ships an update every 3 months, and AQN Link every 9 days. Most recently, HYDROS App was updated on November 2, 2026 and AQN Link on October 24, 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.*