# HYDROS App vs Reef.Tools

The clearest difference is review sentiment: HYDROS App at 62% against Reef.Tools's 0%. HYDROS App also leads on rating (3.7 vs 3.0) and ratings volume (22 vs 2). Reef.Tools's advantage is update cadence (daily vs every 3 months). 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 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 2, 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 Reef.Tools's.

HYDROS App ships an update every 3 months, Reef.Tools daily. Both last shipped on September 30, 2026.

## The numbers

| Metric | HYDROS App | Reef.Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (22 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/reeftools/id6739948464/reviews) |
| Number of ratings | **22** | 2 |
| Positive reviews | **62.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | Free | Free |
| Size | 70 MB | 32 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Coralvue](https://appshunter.io/developer/1455344293) | [Ivena LLC](https://appshunter.io/developer/1787597398) |

## 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


### Reef.Tools

[App page](https://appshunter.io/ios/app/reeftools/id6739948464)

This app simplifies reef tank maintenance with science-backed tools. It offers a precision dosing calculator for over 30 elements, customizable schedules, and insights into water chemistry. Compare your tank's parameters to natural ocean values.

**Highlights:** Precision dosing calculator for 30+ elements, Customizable dosing schedules, Reef chemistry insights, Support for multiple brands and custom targets, Comparison to natural ocean parameters

**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 Reef.Tools free?

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

### Which has better reviews, HYDROS App or Reef.Tools?

HYDROS App is rated higher. HYDROS App averages 3.7 out of 5 from 22 ratings, while Reef.Tools averages 3.0 from 2 ratings.

### Do HYDROS App or Reef.Tools have ads?

Neither HYDROS App nor Reef.Tools shows ads.

### Which is updated more often, HYDROS App or Reef.Tools?

HYDROS App ships an update every 3 months, and Reef.Tools daily. Most recently, HYDROS App was updated on September 30, 2026 and Reef.Tools on September 30, 2026.

---

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