Ground Spray vs NozzleCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ground Spray
This utility app helps custom applicators and growers predict spray quality and droplet size spectrum before application. It uses research data to calculate spray characteristics based on user-inputted parameters like nozzle type and pressure, aiding in pesticide efficacy and drift mitigation.
- Predict spray quality
- Calculate droplet size spectrum
- Input nozzle type, angle, orifice size, pressure
- Save and email results
- Mitigate pesticide drift
- Access up-to-date spray quality information
Read full descriptionHide full description
The Pesticide Application Technology group at the University of Nebraska-Lincoln ‘s West Central Research and Extension Center (WCREC) in North Platte, NE, is dedicated to investigating aspects of pesticide applications, with emphasis on efficacy and drift. We are utilizing new technologies, including laser diffraction systems in a static chamber, a low-speed wind tunnel and a high-speed wind tunnel, to explore application methods and technologies, such as nozzle selection, adjuvant chemistry, sprayer set up, and wind speed. Our goal is to understand how these factors and others interact to influence spray quality, pesticide efficacy, and drift. We have formed close partnerships with both industry and academic collaborators, including Wilbur-Ellis Co., The Aerial Application Technology team within the USDA-ARS, and the University of Queensland, Australia. It is our mission to work with these groups and others interested in maximizing pesticide efficacy and mitigating pesticide drift. We feel that these research efforts are critical to ensuring that yield loss due to pests does not jeopardize our ability to create food, fiber and fuel for a growing world population as well as ensure the health and sustainability of humankind and our environment. This application will allow custom applicators and growers the ability to easily predict the spray quality of their application before it is applied. The user can input nozzle type, spray angle, orifice size, spray pressure, and solution and the application will calculate the spray quality based on our research. The user will be able to save these results or e-mail them to another person or company. This application will also give the droplet size spectrum for the various input parameters which will allow the applicator to have a sense of the potential of the spray to drift. As our research program moves forward, more data points will be added such that any ground applicator can have access to the most up to date information on spray quality.
NozzleCalc
Quickly calculate sprayer settings for specific nozzles on the go. Determine optimum droplet size and PSI for your applications. Includes a reference section and direct contact to support.
- Sprayer setting calculations
- Droplet size determination
- PSI calculation
- Customizable application rate, speed, and spacing
- Reference section
- Direct contact to support
Read full descriptionHide full description
Now you can quickly calculate sprayer settings for TurboDrop and AirMix nozzles anywhere with the official Greenleaf Technologies Nozzle Calculator app. Determine optimum droplet size and PSI for all your applications on-the-go and spray with confidence. If you use Greenleaf Technologies spray nozzles for your applications this is the app you shouldn't be without! This is the simplest and most accurate nozzle calculator app for Greenleaf nozzles. See the droplet size each nozzle size generates at a variety of precise pressures. Customize by setting your application rate (gal/ac), speed (mph), spacing (inches), and flowrate (gal/min). The reference section provides additional product info and industry terminology. Speak directly to a knowledgeable Greenleaf Technologies representative with a touch with the autodial contact feature.
Screenshots
Verdict
The clearest difference is update cadence: Ground Spray at every 12 months against NozzleCalc's every 49 months. Ground Spray also leads on iOS requirement (9.3 vs 11.0). On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Ground Spray against 5.0 for NozzleCalc. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Ground Spray ships an update every 12 months, NozzleCalc every 49 months. The most recent releases landed on October 5, 2026 and September 23, 2026 respectively.
| Parameter | Ground Spray | NozzleCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 12 months — better | Every 49 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.3 — better | 11.0 |
| Further details — not scored | ||
| Size | 10 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | University of Nebraska - Lincoln | Greenleaf Technologies |
Customer experience
Ground Spray
NozzleCalc
In-app purchases
Ground Spray
No in-app purchases
NozzleCalc
No in-app purchases









