# VPD Chart vs Cool Cure by Cannatrol

The clearest difference is review sentiment: VPD Chart at 74% against Cool Cure by Cannatrol's 0%. VPD Chart also leads on rating (4.5 vs 2.7) and ratings volume (30 vs 3). Cool Cure by Cannatrol's advantage is in-app purchases (none vs 2). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. VPD Chart sells 2 in-app purchases, starting at $3.99 per month. Cool Cure by Cannatrol asks for nothing beyond the download.

VPD Chart holds the better App Store score, 4.5 against 2.7. That said, the two scores are not equally well evidenced: VPD Chart has 30 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 74% of VPD Chart's written reviews are positive against 0% of Cool Cure by Cannatrol's.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 22, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | VPD Chart | Cool Cure by Cannatrol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (30 ratings)](https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews)** | [2.7 (3 ratings)](https://appshunter.io/ios/app/cool-cure-by-cannatrol/id6746351407/reviews) |
| Number of ratings | **30** | 3 |
| Positive reviews | **73.7% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 49 MB | 25 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [INNOVO DEV S.R.L.](https://appshunter.io/developer/1814828527) | [Cannatrols](https://appshunter.io/developer/1816353293) |

## What reviewers say

### VPD Chart

[App page](https://appshunter.io/ios/app/vpd-chart/id6470015847)

This app calculates Vapor Pressure Deficit (VPD) using air temperature, relative humidity, and canopy temperature. It offers real-time charting, sensor integration, and educational tools to understand plant growth environments. Organize data by zones and visualize dew point areas.

**Highlights:** VPD calculation, Interactive VPD chart, Sensor integration, Zone organization, Dew point visualization, Grow Timeline

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VPD Chart Plus (monthly) | $3.99 | per month |
| VPD Chart Plus (annual) | $29.99 | per year |


### 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 VPD Chart free?

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

### Is Cool Cure by Cannatrol free?

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

### Which has better reviews, VPD Chart or Cool Cure by Cannatrol?

VPD Chart is rated higher. VPD Chart averages 4.5 out of 5 from 30 ratings, while Cool Cure by Cannatrol averages 2.7 from 3 ratings.

### Do VPD Chart or Cool Cure by Cannatrol have ads?

Neither VPD Chart nor Cool Cure by Cannatrol shows ads.

### Which is updated more often, VPD Chart or Cool Cure by Cannatrol?

VPD Chart ships an update every 3 weeks, and Cool Cure by Cannatrol every 3 weeks. Most recently, VPD Chart was updated on September 22, 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.*