# Marlin Remote vs VPD Chart

The clearest difference is in-app purchases: Marlin Remote at none against VPD Chart's 2. Marlin Remote also leads on iOS requirement (13.0 vs 15.1). 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. Marlin Remote asks for nothing beyond the download.

Marlin Remote ships an update every 5 weeks, VPD Chart every 3 weeks. The most recent releases landed on September 11, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Marlin Remote | VPD Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (30 ratings)](https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews)** |
| Number of ratings | — | **30** |
| Positive reviews | — | 73.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 242 MB | 49 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Zucchetti Centro Sistemi S.p.A.](https://appshunter.io/developer/563446312) | [INNOVO DEV S.R.L.](https://appshunter.io/developer/1814828527) |

## What reviewers say

### Marlin Remote

[App page](https://appshunter.io/ios/app/marlin-remote/id1054912000)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Marlin Remote free?

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

### Is VPD Chart free?

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

### Do Marlin Remote or VPD Chart have ads?

Neither Marlin Remote nor VPD Chart shows ads.

### Which is updated more often, Marlin Remote or VPD Chart?

Marlin Remote ships an update every 5 weeks, and VPD Chart every 3 weeks. Most recently, Marlin Remote was updated on September 11, 2026 and VPD Chart on September 22, 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.*