# GDU Calculator vs Agvance SKY Mapping

The clearest difference is review sentiment: Agvance SKY Mapping at 100% against GDU Calculator's 25%. Agvance SKY Mapping also leads on rating (3.7 vs 2.5) and update cadence (fortnightly vs every 6 weeks). GDU Calculator's advantage is iOS requirement (13.0 vs 15.6). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Agvance SKY Mapping holds the better App Store score, 3.7 against 2.5. Both are backed by a comparable volume of ratings — 11 and 12 respectively. Written reviews point the same way: 25% of GDU Calculator's written reviews are positive against 100% of Agvance SKY Mapping's.

GDU Calculator ships an update every 6 weeks, Agvance SKY Mapping fortnightly. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | GDU Calculator | Agvance SKY Mapping |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (11 ratings)](https://appshunter.io/ios/app/gdu-calculator/id850528308/reviews) | **[3.7 (12 ratings)](https://appshunter.io/ios/app/agvance-sky-mapping/id1467186402/reviews)** |
| Number of ratings | 11 | **12** |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 57 MB | 202 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Ag PhD](https://appshunter.io/developer/520210329) | [Software Solutions Integrated, LLC](https://appshunter.io/developer/506417070) |

## What reviewers say

### 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, Vision Pro support

**In-app purchases:** none


### Agvance SKY Mapping

[App page](https://appshunter.io/ios/app/agvance-sky-mapping/id1467186402)

Manage growers and fields with advanced mapping tools. Initiate soil sampling, delineate field boundaries, and utilize scouting features. Generate reports and review field layers for comprehensive agricultural insights.

**Highlights:** Grower and field management, Soil sampling initiation, Field boundary delineation, Scouting tools, Report generation (PDF/paper), Field layer review

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

**In-app purchases:** none


## Frequently asked questions

### Is GDU Calculator free?

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

### Is Agvance SKY Mapping free?

Agvance SKY Mapping is free to download, with no in-app purchases.

### Which has better reviews, GDU Calculator or Agvance SKY Mapping?

Agvance SKY Mapping is rated higher. GDU Calculator averages 2.5 out of 5 from 11 ratings, while Agvance SKY Mapping averages 3.7 from 12 ratings.

### Do GDU Calculator or Agvance SKY Mapping have ads?

Neither GDU Calculator nor Agvance SKY Mapping shows ads.

### Which is updated more often, GDU Calculator or Agvance SKY Mapping?

GDU Calculator ships an update every 6 weeks, and Agvance SKY Mapping fortnightly. Most recently, GDU Calculator was updated on November 1, 2026 and Agvance SKY Mapping on October 25, 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.*