# GDU Calculator vs PDCM 24/7

The clearest difference is update cadence: GDU Calculator at every 6 weeks against PDCM 24/7's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

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

GDU Calculator ships an update every 6 weeks, PDCM 24/7 every 4 months. The most recent releases landed on November 4, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | GDU Calculator | PDCM 24/7 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (11 ratings)](https://appshunter.io/ios/app/gdu-calculator/id850528308/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free | — |
| Size | 57 MB | 29 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Ag PhD](https://appshunter.io/developer/520210329) | [Pedersen, Dowie, Clabby & McCausland Insurance, Inc.](https://appshunter.io/developer/1447416714) |

## 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


### PDCM 24/7

[App page](https://appshunter.io/ios/app/pdcm-247/id1148662600)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is GDU Calculator free?

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

### Is PDCM 24/7 free?

PDCM 24/7 is free to download, with no in-app purchases.

### Do GDU Calculator or PDCM 24/7 have ads?

Neither GDU Calculator nor PDCM 24/7 shows ads.

### Which is updated more often, GDU Calculator or PDCM 24/7?

GDU Calculator ships an update every 6 weeks, and PDCM 24/7 every 4 months. Most recently, GDU Calculator was updated on November 4, 2026 and PDCM 24/7 on November 2, 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.*