# iENV vs Mars Hydro

The clearest difference is rating: iENV at 3.1 against Mars Hydro's 2.6. iENV also leads on iOS requirement (12.0 vs 15.0). Mars Hydro's advantage is ratings volume (27 vs 7). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iENV holds the better App Store score, 3.1 against 2.6. Both are backed by a comparable volume of ratings — 7 and 27 respectively. Written reviews split almost evenly too, at 24% and 24% positive.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 22, 2026 and August 11, 2026 respectively.

## The numbers

| Metric | iENV | Mars Hydro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (7 ratings)](https://appshunter.io/ios/app/ienv/id1260827700/reviews)** | [2.6 (27 ratings)](https://appshunter.io/ios/app/mars-hydro/id6479227564/reviews) |
| Number of ratings | 7 | **27** |
| Positive reviews | **24.2% of reviews** | 23.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Free | Free |
| Size | 70 MB | 45 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [UNI-TREND TECHNOLOGY (CHINA) CO.,LTD.](https://appshunter.io/developer/1207185875) | [MARS TRADING RCC, INC.](https://appshunter.io/developer/1726858942) |

## What reviewers say

### iENV

[App page](https://appshunter.io/ios/app/ienv/id1260827700)

This utility app connects UNI-T environmental meters to your smartphone via Bluetooth. It displays and records real-time data for temperature, humidity, noise, wind speed, light intensity, and rotation speed from compatible UNI-T devices.

**Highlights:** Bluetooth connectivity to UNI-T meters, Real-time data display, Data recording capabilities, Supports multiple environmental parameters, Compatible with various UNI-T meter models

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is iENV free?

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

### Is Mars Hydro free?

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

### Which has better reviews, iENV or Mars Hydro?

iENV is rated higher. iENV averages 3.1 out of 5 from 7 ratings, while Mars Hydro averages 2.6 from 27 ratings.

### Do iENV or Mars Hydro have ads?

Neither iENV nor Mars Hydro shows ads.

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

iENV ships an update monthly, and Mars Hydro monthly. Most recently, iENV was updated on September 22, 2026 and Mars Hydro on August 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.*