# Mars Hydro vs Cool Cure by Cannatrol

Mars Hydro and Cool Cure by Cannatrol both sit at 2.6 stars, but that hides the real split: 24% of Mars Hydro's written reviews are positive against 0% of Cool Cure by Cannatrol's. Mars Hydro also leads on ratings volume (27 vs 3). On price, rating, 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.

On the App Store both sit at effectively the same score — 2.6 for Mars Hydro against 2.7 for Cool Cure by Cannatrol. That said, the two scores are not equally well evidenced: Mars Hydro has 27 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 24% of Mars Hydro's written reviews are positive against 0% of Cool Cure by Cannatrol's.

Mars Hydro ships an update monthly, Cool Cure by Cannatrol every 3 weeks. The most recent releases landed on August 11, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | Mars Hydro | Cool Cure by Cannatrol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (27 ratings)](https://appshunter.io/ios/app/mars-hydro/id6479227564/reviews) | **[2.7 (3 ratings)](https://appshunter.io/ios/app/cool-cure-by-cannatrol/id6746351407/reviews)** |
| Number of ratings | **27** | 3 |
| Positive reviews | **23.8% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 45 MB | 25 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [MARS TRADING RCC, INC.](https://appshunter.io/developer/1726858942) | [Cannatrols](https://appshunter.io/developer/1816353293) |

## 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


### Cool Cure by Cannatrol

[App page](https://appshunter.io/ios/app/cool-cure-by-cannatrol/id6746351407)

Remotely monitor and manage drying, curing, and storage cycles for your C2 and CLE units. Adjust temperature, dew point, and lighting, and receive instant alerts for optimal results.

**Highlights:** Remote monitoring and adjustment, Real-time temperature and dew point control, Customizable cycle times, Interior LED lighting control, Instant alerts and updates, Vaportrol® Technology integration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mars Hydro free?

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

### Is Cool Cure by Cannatrol free?

Cool Cure by Cannatrol is free to download, with no in-app purchases.

### Which has better reviews, Mars Hydro or Cool Cure by Cannatrol?

Cool Cure by Cannatrol is rated higher. Mars Hydro averages 2.6 out of 5 from 27 ratings, while Cool Cure by Cannatrol averages 2.7 from 3 ratings.

### Do Mars Hydro or Cool Cure by Cannatrol have ads?

Neither Mars Hydro nor Cool Cure by Cannatrol shows ads.

### Which is updated more often, Mars Hydro or Cool Cure by Cannatrol?

Mars Hydro ships an update monthly, and Cool Cure by Cannatrol every 3 weeks. Most recently, Mars Hydro was updated on August 11, 2026 and Cool Cure by Cannatrol on September 3, 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.*