# VPD Chart vs GrowDat

The clearest difference is rating: GrowDat at 5.0 against VPD Chart's 4.5. VPD Chart's advantage is ratings volume (30 vs 3) and update cadence (every 3 weeks vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. VPD Chart sells 2 in-app purchases, starting at $3.99 per month and GrowDat sells 5 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

GrowDat holds the better App Store score, 5.0 against 4.5. 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.

VPD Chart ships an update every 3 weeks, GrowDat every 2 months. The most recent releases landed on September 22, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | VPD Chart | GrowDat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (30 ratings)](https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/growdat-grow-tracker/id6751731720/reviews)** |
| Number of ratings | **30** | 3 |
| Positive reviews | 73.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 49 MB | 121 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) | [GrowDat UG (haftungsbeschrankt)](https://appshunter.io/developer/1836486383) |

## 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 |


### GrowDat

[App page](https://appshunter.io/ios/app/growdat-grow-tracker/id6751731720)

This app helps users meticulously track and analyze their cannabis cultivation process. It functions as a digital journal, offering insights into plant health and growth stages, and connects users with a global community of growers for shared learning and inspiration.

**Highlights:** Digital grow journal, Data dashboard and analysis, Growth stage tracking, Community forum, VPD calculator, Smart reminders

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $2.99 | per month |
| Yearly subscription | $24.99 | per year |
| Support GrowDat | $1.99 | one-time |
| Support GrowDat Plus | $4.99 | one-time |
| Support GrowDat Max | $9.99 | one-time |


## Frequently asked questions

### Is VPD Chart free?

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

### Is GrowDat free?

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

### Which has better reviews, VPD Chart or GrowDat?

GrowDat is rated higher. VPD Chart averages 4.5 out of 5 from 30 ratings, while GrowDat averages 5.0 from 3 ratings.

### Do VPD Chart or GrowDat have ads?

Neither VPD Chart nor GrowDat shows ads.

### Which is updated more often, VPD Chart or GrowDat?

VPD Chart ships an update every 3 weeks, and GrowDat every 2 months. Most recently, VPD Chart was updated on September 22, 2026 and GrowDat on September 8, 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.*