# NSTracker vs GDU Calculator

The clearest difference is review sentiment: NSTracker at 100% against GDU Calculator's 25%. NSTracker also leads on rating (4.3 vs 2.5). GDU Calculator's advantage is iOS requirement (13.0 vs 15.1). On price, ratings volume, update cadence 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.

NSTracker holds the better App Store score, 4.3 against 2.5. Both are backed by a comparable volume of ratings — 7 and 11 respectively. Written reviews point the same way: 100% of NSTracker's written reviews are positive against 25% of GDU Calculator's.

NSTracker ships an update every 2 months, GDU Calculator every 6 weeks. Both last shipped on October 23, 2026.

## The numbers

| Metric | NSTracker | GDU Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (7 ratings)](https://appshunter.io/ios/app/nstracker/id516392828/reviews)** | [2.5 (11 ratings)](https://appshunter.io/ios/app/gdu-calculator/id850528308/reviews) |
| Number of ratings | 7 | **11** |
| Positive reviews | **100.0% of reviews** | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 67 MB | 57 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nutrien AG Solutions, Inc.](https://appshunter.io/developer/516392831) | [Ag PhD](https://appshunter.io/developer/520210329) |

## What reviewers say

### NSTracker

[App page](https://appshunter.io/ios/app/nstracker/id516392828)

This app allows field samplers to submit lab samples for soil, tissue, and water. It supports adding growers, farms, and fields, with geospatial mapping and access to historical data. Users can also manage favorites and customize their experience.

**Highlights:** Lab sample submission (soil, tissue, water), Grower, farm, and field management, Geospatial boundary mapping, Sample history and report access, Quick resampling, Favorites and customization

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

**In-app purchases:** none


### GDU Calculator

[App page](https://appshunter.io/ios/app/gdu-calculator/id850528308)

This app helps corn and wheat growers calculate Growing Degree Units (GDUs) for their crops. It provides daily temperature and GDU data, and can send push notifications about potential field issues based on crop growth stages.

**Highlights:** Growing Degree Unit calculation, Corn and wheat crop support, Day-by-day temperature data, Push notifications for field issues, Crop growth stage tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NSTracker free?

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

### Is GDU Calculator free?

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

### Which has better reviews, NSTracker or GDU Calculator?

NSTracker is rated higher. NSTracker averages 4.3 out of 5 from 7 ratings, while GDU Calculator averages 2.5 from 11 ratings.

### Do NSTracker or GDU Calculator have ads?

Neither NSTracker nor GDU Calculator shows ads.

### Which is updated more often, NSTracker or GDU Calculator?

NSTracker ships an update every 2 months, and GDU Calculator every 6 weeks. Most recently, NSTracker was updated on October 23, 2026 and GDU Calculator on October 23, 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.*