# HYDROS App vs ReefCtrl

The clearest difference is review sentiment: ReefCtrl at 100% against HYDROS App's 62%. ReefCtrl also leads on update cadence (every 9 days vs every 3 months) and iOS requirement (13.0 vs 15.6). 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, ReefCtrl every 9 days. The most recent releases landed on October 9, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | HYDROS App | ReefCtrl |
| --- | --- | --- |
| 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 | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Free | Free |
| Size | 70 MB | 3 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Coralvue](https://appshunter.io/developer/1455344293) | [Jayanth Vignesh Ramachandran](https://appshunter.io/developer/1896691974) |

## 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


### ReefCtrl

[App page](https://appshunter.io/ios/app/reefctrl/id6769832090)

Manage your reef aquarium with this intelligent platform. Monitor equipment, track water chemistry, and receive smart alerts. It integrates with Neptune Apex controllers and offers AI-powered assistance for hobbyists.

**Highlights:** Neptune Apex integration, Smart alerts and notifications, Water chemistry tracking, Dosing management, AI reef assistant, Equipment and livestock management

**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 ReefCtrl free?

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

### Do HYDROS App or ReefCtrl have ads?

Neither HYDROS App nor ReefCtrl shows ads.

### Which is updated more often, HYDROS App or ReefCtrl?

HYDROS App ships an update every 3 months, and ReefCtrl every 9 days. Most recently, HYDROS App was updated on October 9, 2026 and ReefCtrl on October 4, 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.*