# OpenSprinkler vs VPD Chart

The clearest difference is rating: VPD Chart at 4.5 against OpenSprinkler's 3.9. VPD Chart also leads on update cadence (every 3 weeks vs every 2 months) and review sentiment (74% vs 65%). OpenSprinkler's advantage is in-app purchases (none vs 2). On price, ratings volume, 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. OpenSprinkler asks for nothing beyond the download.

VPD Chart holds the better App Store score, 4.5 against 3.9. Both are backed by a comparable volume of ratings — 29 and 30 respectively. Written reviews point the same way: 65% of OpenSprinkler's written reviews are positive against 74% of VPD Chart's.

OpenSprinkler ships an update every 2 months, VPD Chart every 3 weeks. The most recent releases landed on September 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | OpenSprinkler | VPD Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (29 ratings)](https://appshunter.io/ios/app/opensprinkler/id830988967/reviews) | **[4.5 (30 ratings)](https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews)** |
| Number of ratings | 29 | **30** |
| Positive reviews | 64.8% of reviews | **73.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 6 MB | 49 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OpenThings](https://appshunter.io/developer/1526685906) | [INNOVO DEV S.R.L.](https://appshunter.io/developer/1814828527) |

## What reviewers say

### OpenSprinkler

[App page](https://appshunter.io/ios/app/opensprinkler/id830988967)

Control your OpenSprinkler irrigation system remotely. Monitor device status, modify watering schedules, and launch programs instantly. Features manual testing, multi-device support, and weather integration.

**Highlights:** Device status monitoring, Program modification, Instant program launch, Manual testing mode, Multi-device support, Weather and forecast integration, Log data visualization

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

**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 OpenSprinkler free?

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

### Is VPD Chart free?

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

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

VPD Chart is rated higher. OpenSprinkler averages 3.9 out of 5 from 29 ratings, while VPD Chart averages 4.5 from 30 ratings.

### Do OpenSprinkler or VPD Chart have ads?

Neither OpenSprinkler nor VPD Chart shows ads.

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

OpenSprinkler ships an update every 2 months, and VPD Chart every 3 weeks. Most recently, OpenSprinkler was updated on September 24, 2026 and VPD Chart on October 9, 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.*