# HYDROS App vs REEFB

The clearest difference is review sentiment: HYDROS App at 62% against REEFB's 0%. HYDROS App also leads on rating (3.7 vs 3.0) and ratings volume (22 vs 1). REEFB's advantage is iOS requirement (13.0 vs 15.6). On price, update cadence, 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.

HYDROS App holds the better App Store score, 3.7 against 3.0. That said, the two scores are not equally well evidenced: HYDROS App has 22 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 62% of HYDROS App's written reviews are positive against 0% of REEFB's.

HYDROS App ships an update every 3 months, REEFB every 2 months. The most recent releases landed on October 9, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | HYDROS App | REEFB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (22 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/reefb/id6738972525/reviews) |
| Number of ratings | **22** | 1 |
| Positive reviews | **62.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 70 MB | 39 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) | [CROWN P & E CO., LTD.](https://appshunter.io/developer/1783223891) |

## 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


### REEFB

[App page](https://appshunter.io/ios/app/reefb/id6738972525)

This app offers intelligent control for REEF B Series devices, simplifying aquarium management. It allows for effortless monitoring and maintenance of aquaculture equipment and schedules via Bluetooth connectivity.

**Highlights:** Dosing modes: 24-hour average, custom, single-dose, Precise dosing calibration, Flexible schedule adjustment, Multi-device management via Bluetooth, Accurate spectrum scheduling for LED lights, Master-sub synchronization for lights, Scene modes for LED lights

**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 REEFB free?

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

### Which has better reviews, HYDROS App or REEFB?

HYDROS App is rated higher. HYDROS App averages 3.7 out of 5 from 22 ratings, while REEFB averages 3.0 from 1 ratings.

### Do HYDROS App or REEFB have ads?

Neither HYDROS App nor REEFB shows ads.

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

HYDROS App ships an update every 3 months, and REEFB every 2 months. Most recently, HYDROS App was updated on October 9, 2026 and REEFB on October 11, 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.*