# MRTN Rate Calculator vs Working Trees App

The clearest difference is update cadence: Working Trees App at monthly against MRTN Rate Calculator's every 5 months. MRTN Rate Calculator's advantage is iOS requirement (10.0 vs 15.0). On price, rating, ratings volume and ads there is nothing between them.

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 MRTN Rate Calculator against 5.0 for Working Trees App. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

MRTN Rate Calculator ships an update every 5 months, Working Trees App monthly. The most recent releases landed on October 21, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | MRTN Rate Calculator | Working Trees App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/mrtn-rate-calculator/id560788301/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/working-trees-app/id6737707238/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Free | Free |
| Size | 57 MB | 78 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [University of Illinois](https://appshunter.io/developer/422670617) | [WORKING TREES, INC.](https://appshunter.io/developer/1621922178) |

## What reviewers say

### MRTN Rate Calculator

[App page](https://appshunter.io/ios/app/mrtn-rate-calculator/id560788301)

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.

**Highlights:** Customized nitrogen rate recommendations, Combines agronomic research, Considers economic fluctuations, Maximizes return on investment

**In-app purchases:** none


### Working Trees App

[App page](https://appshunter.io/ios/app/working-trees-app/id6737707238)

This app helps users quickly measure trees to estimate carbon sequestration. It manages sample plots, planting campaigns, and tree data collection, even offline. Features include a visual interface for measurements, data management, and a map tool for planting locations.

**Highlights:** Estimate carbon sequestration in woody biomass, Manage sample plots and tree data, Record tree diameter and height, Geolocation and photo capture, Offline data collection, Map tool for planting locations

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

**In-app purchases:** none


## Frequently asked questions

### Is MRTN Rate Calculator free?

MRTN Rate Calculator is free to download, with no in-app purchases.

### Is Working Trees App free?

Working Trees App is free to download, with no in-app purchases.

### Which has better reviews, MRTN Rate Calculator or Working Trees App?

MRTN Rate Calculator and Working Trees App are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do MRTN Rate Calculator or Working Trees App have ads?

Neither MRTN Rate Calculator nor Working Trees App shows ads.

### Which is updated more often, MRTN Rate Calculator or Working Trees App?

MRTN Rate Calculator ships an update every 5 months, and Working Trees App monthly. Most recently, MRTN Rate Calculator was updated on October 21, 2026 and Working Trees App on October 10, 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.*