# HYDROS App vs Nix Knows

The clearest difference is rating: Nix Knows at 5.0 against HYDROS App's 3.6. Nix Knows also leads on update cadence (fortnightly vs every 3 months) and iOS requirement (13.0 vs 15.6). HYDROS App's advantage is ratings volume (23 vs 1). 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.

Nix Knows holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: HYDROS App has 23 ratings behind it against 1, so its average is the more settled of the two.

HYDROS App ships an update every 3 months, Nix Knows fortnightly. The most recent releases landed on October 22, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | HYDROS App | Nix Knows |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (23 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nix-knows/id6737751739/reviews)** |
| Number of ratings | **23** | 1 |
| Positive reviews | 62.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 70 MB | 40 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Coralvue](https://appshunter.io/developer/1455344293) | [Nix App](https://appshunter.io/developer/1746031173) |

## 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


### Nix Knows

[App page](https://appshunter.io/ios/app/nix-knows/id6737751739)

This platform provides real-time vehicle data, including fuel consumption and emissions, when paired with a physical logger key. It simplifies fleet management by capturing GPS location using native phone capabilities, eliminating the need for separate data plans.

**Highlights:** Real-time vehicle data, Fuel burn and emissions tracking, Maintenance needs alerts, Vehicle GPS location capture, AI-powered monitoring, Fleet management tools

**In-app purchases:** none


## Frequently asked questions

### Is HYDROS App free?

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

### Is Nix Knows free?

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

### Which has better reviews, HYDROS App or Nix Knows?

Nix Knows is rated higher. HYDROS App averages 3.6 out of 5 from 23 ratings, while Nix Knows averages 5.0 from 1 ratings.

### Do HYDROS App or Nix Knows have ads?

Neither HYDROS App nor Nix Knows shows ads.

### Which is updated more often, HYDROS App or Nix Knows?

HYDROS App ships an update every 3 months, and Nix Knows fortnightly. Most recently, HYDROS App was updated on October 22, 2026 and Nix Knows on October 19, 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.*