GDU Calculator vs Fly PHX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GDU Calculator
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.
- Growing Degree Unit calculation
- Corn and wheat crop support
- Day-by-day temperature data
- Push notifications for field issues
- Crop growth stage tracking
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The Ag PhD GDU Calculator is a reference for corn and wheat growers to determine the amount of Growing Degree Units for their crops in the current crop season. Includes day-by-day breakdown of temperature and GDU data and has the option for push notifications informing growers of potential problems in their fields based on their crop growth stage, as calculated by the crop GDU from planting date.
Fly PHX
This application enables pilots to easily operate a drone for capturing high-resolution aerial imagery. It facilitates pre-flight planning, real-time flight control, and communication with onboard sensors. The captured data can be used for detailed analysis and reporting on crop health.
- Real-time sensor communication
- Pre-flight planning tools
- Survey area visualization
- Sentera PHX flight control
- Data for FieldAgent platform
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Fly PHX helps pilots fly the Sentera PHX with ease to capture high-resolution imagery to generate real-time insights and analytics. What’s great about Fly PHX? -Communicate with the installed sensor, like the Double 4K from Sentera, and display readiness status, GPS fix type, photo count, and file storage information -Conduct pre-flight planning activities to ensure you are adhering to safety best practices -View survey area and control the Sentera PHX when in the air Data captured from the Sentera PHX flight is then available for use in Sentera’s FieldAgent platform, which provides data visualization and reporting to dig deeper into analysis to understand crop health performance throughout the season, from emergence to harvest and every stage in between.
Screenshots
Verdict
The clearest difference is rating: Fly PHX at 5.0 against GDU Calculator's 2.5. Fly PHX also leads on iOS requirement (11.0 vs 13.0). GDU Calculator's advantage is ads (none vs shown) and update cadence (every 6 weeks vs every 6 months). On price, ratings volume and in-app purchases there is nothing between them.
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.
Fly PHX holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 11 and 4 respectively.
GDU Calculator ships an update every 6 weeks, Fly PHX every 6 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | GDU Calculator | Fly PHX |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (11 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 11 — better | 4 |
| Update frequency | Every 6 weeks — better | Every 6 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 57 MB | 77 MB |
| Age rating | +4 | 4+ |
| Developer | Ag PhD | Sentera, Inc. |
Customer experience
GDU Calculator
Fly PHX
In-app purchases
GDU Calculator
No in-app purchases
Fly PHX
No in-app purchases
Questions
Is GDU Calculator free?
Is Fly PHX free?
Which has better reviews, GDU Calculator or Fly PHX?
Do GDU Calculator or Fly PHX have ads?
Which is updated more often, GDU Calculator or Fly PHX?
Other comparisons
