MRTN Rate Calculator vs GrazeOK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MRTN Rate Calculator
This utility calculates the optimal nitrogen fertilizer rate for crops based on agronomic research and current economic conditions. It provides a customized recommendation to maximize returns.
- Customized nitrogen rate recommendations
- Combines agronomic research
- Considers economic fluctuations
- Maximizes return on investment
Read full descriptionHide full description
The Maximum Return To Nitrogen (MRTN) calculations combine the agronomics of nitrogen rate research and the realities of economic fluctuations to provide a customized nitrogen rate.
GrazeOK
Read full descriptionHide full description
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
MRTN Rate Calculator and GrazeOK are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
MRTN Rate Calculator ships an update every 5 months, GrazeOK every 2 months. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.
| Parameter | MRTN Rate Calculator | GrazeOK |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 57 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | University of Illinois | Oklahoma State University |
In-app purchases
MRTN Rate Calculator
No in-app purchases
GrazeOK
No in-app purchases
Questions
Is MRTN Rate Calculator free?
Is GrazeOK free?
Do MRTN Rate Calculator or GrazeOK have ads?
Which is updated more often, MRTN Rate Calculator or GrazeOK?
Other comparisons
