# VPD Chart vs Spider Farmer

The clearest difference is rating: VPD Chart at 4.5 against Spider Farmer's 3.3. VPD Chart also leads on review sentiment (74% vs 43%). Spider Farmer's advantage is in-app purchases (none vs 2) and ratings volume (135 vs 31). 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. Spider Farmer asks for nothing beyond the download.

VPD Chart holds the better App Store score, 4.5 against 3.3. Both are backed by a comparable volume of ratings — 31 and 135 respectively. Written reviews point the same way: 74% of VPD Chart's written reviews are positive against 43% of Spider Farmer's.

VPD Chart ships an update every 3 weeks, Spider Farmer every 5 weeks. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | VPD Chart | Spider Farmer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (31 ratings)](https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews)** | [3.3 (135 ratings)](https://appshunter.io/ios/app/spider-farmer/id6476436750/reviews) |
| Number of ratings | 31 | **135** |
| Positive reviews | **73.7% of reviews** | 43.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 49 MB | 61 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [INNOVO DEV S.R.L.](https://appshunter.io/developer/1814828527) | [HY AGRICULTURE WHOLESALE LIMITED](https://appshunter.io/developer/1726713107) |

## 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 |


### Spider Farmer

[App page](https://appshunter.io/ios/app/spider-farmer/id6476436750)

Control your indoor grow environment with precision and ease. This app offers intuitive controls and real-time insights to optimize plant cultivation, leading to smarter and more sustainable yields.

**Highlights:** Precision grow environment control, Real-time insights, Intuitive controls, Optimize plant cultivation, Smarter yields, Sustainable yields

**In-app purchases:** none


## Frequently asked questions

### Is VPD Chart free?

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

### Is Spider Farmer free?

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

### Which has better reviews, VPD Chart or Spider Farmer?

VPD Chart is rated higher. VPD Chart averages 4.5 out of 5 from 31 ratings, while Spider Farmer averages 3.3 from 135 ratings.

### Do VPD Chart or Spider Farmer have ads?

Neither VPD Chart nor Spider Farmer shows ads.

### Which is updated more often, VPD Chart or Spider Farmer?

VPD Chart ships an update every 3 weeks, and Spider Farmer every 5 weeks. Most recently, VPD Chart was updated on October 22, 2026 and Spider Farmer on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*