NozzleCalc vs GrazeOK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
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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.
GrazeOK
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Managing livestock demands accurate and fast decisions for a successful operation. Nowadays, managers rely on either inaccurate visual inferences or expensive tools for acquiring fast answers to in-farm issues. GrazeOK is a user friendly electronic version of the Oklahoman grazing stick which allows fast and proper estimation of stock density, number of pastures, grazing and rest days by simply measuring plant height and canopy cover with a yard stick and inputting them in your phone. How it works: 1. Download GrazeOK, 2. With a yard stick, measure forage height and canopy cover (optional), 3. Input your operation details: forage species, livestock, grazing system (continuous, rotational, etc), 4. Get proper stock density, number of pastures, grazing and rest days for your operation. The results will be displayed in the screen of your phone and emailed to you (optional).
Screenshots
Verdict
The clearest difference is update cadence: GrazeOK at every 2 months against NozzleCalc's every 49 months. GrazeOK also leads on iOS requirement (9.0 vs 11.0). On price, ads, in-app purchases and device support 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.
NozzleCalc ships an update every 49 months, GrazeOK every 2 months. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.
| Parameter | NozzleCalc | GrazeOK |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 49 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Greenleaf Technologies | Oklahoma State University |
In-app purchases
NozzleCalc
No in-app purchases
GrazeOK
No in-app purchases









