# Mars Hydro vs Nitrify

The clearest difference is in-app purchases: Mars Hydro at none against Nitrify's 1. Mars Hydro also leads on iOS requirement (15.0 vs 26.2). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Nitrify sells 1 one-off in-app purchase. Mars Hydro asks for nothing beyond the download.

Mars Hydro ships an update every 2 months, Nitrify every 6 weeks. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Mars Hydro | Nitrify |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (35 ratings)](https://appshunter.io/ios/app/mars-hydro/id6479227564/reviews)** | — |
| Number of ratings | **35** | — |
| Positive reviews | 26.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 52 MB | 2 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [MARS TRADING RCC, INC.](https://appshunter.io/developer/1726858942) | [Charith Perera](https://appshunter.io/developer/1854264019) |

## What reviewers say

### Mars Hydro

[App page](https://appshunter.io/ios/app/mars-hydro/id6479227564)

Control your smart grow system with this app. Manage LED lights, ventilation, and monitor environmental data like CO2, temperature, and humidity for optimal plant growth. Automate your entire grow kit to mimic natural conditions.

**Highlights:** LED light control with timers and simulation, Ventilation system management, Complete grow kit automation via iHub, Environmental data monitoring (CO2, temp, humidity, PPFD), Sunrise and sunset simulation

**In-app purchases:** none


### Nitrify

[App page](https://appshunter.io/ios/app/nitrify-aquarium-water-test/id6787839482)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nitrify Pro | $6.99 | one-time |


## Frequently asked questions

### Is Mars Hydro free?

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

### Is Nitrify free?

Nitrify is free to download, with in-app purchases available.

### Do Mars Hydro or Nitrify have ads?

Neither Mars Hydro nor Nitrify shows ads.

### Which is updated more often, Mars Hydro or Nitrify?

Mars Hydro ships an update every 2 months, and Nitrify every 6 weeks. Most recently, Mars Hydro was updated on November 8, 2026 and Nitrify on October 31, 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.*