NDX Ground Ops vs GTP API Gravity Calculator2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NDX Ground Ops
This application provides real-time aircraft tracking, allowing users to monitor movements, tows, and flights. It also enables the generation of reports and identification of damage, with detailed statistics available via a web interface.
- Real-time aircraft tracking
- Movement and tow monitoring
- Flight data display
- Damage identification
- Report generation
- Web app statistics
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The intuitive interface offers a mobile and web-app that allows users to track aircraft in real time, generate reports and identify damage. The app also tracks aircraft movements, tows, flights and displays statistics in the web app. NDX Ground Ops is an automated application that helps employees quickly and easily view flight data.
GTP API Gravity Calculator2
This application calculates the corrected API gravity at 60°F for jet, gasoline, and diesel fuels. It also determines the total weight of the fuel. It's a digital replacement for physical slide calculators.
- Corrected API gravity calculation
- Total fuel weight calculation
- Supports jet, gasoline, and diesel fuels
- Digital version of slide calculators
- Developed in 2025
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The GTP API Gravity Calculator v2 (Developed 2025) from Gammon Technical Products, Inc. provides users the ability to determine corrected API at 60 Deg F for jet, gasoline, and diesel fuels. The calculator is a digital version of our GTP-3012-1A and GTP-2727EF slide calculators and it also is capable of calculating the total weight of the fuel.
Screenshots
Verdict
The clearest difference is price: NDX Ground Ops at Free against GTP API Gravity Calculator2's $9.99. NDX Ground Ops also leads on rating (5.0 vs 4.0). GTP API Gravity Calculator2's advantage is iOS requirement (12.0 vs 16.6). On ratings volume, update cadence, ads 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
NDX Ground Ops is free to download; GTP API Gravity Calculator2 costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
NDX Ground Ops holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
NDX Ground Ops ships an update every 3 months, GTP API Gravity Calculator2 every 2 months. The most recent releases landed on October 9, 2026 and September 24, 2026 respectively.
| Parameter | NDX Ground Ops | GTP API Gravity Calculator2 |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 5.0 (2 ratings) — better | 4.0 (1 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 16.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 19 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | NDX LLC | Gammon Technical Products |
Customer experience
NDX Ground Ops
GTP API Gravity Calculator2
In-app purchases
NDX Ground Ops
No in-app purchases
GTP API Gravity Calculator2
No in-app purchases
Questions
Is NDX Ground Ops free?
Is GTP API Gravity Calculator2 free?
Which has better reviews, NDX Ground Ops or GTP API Gravity Calculator2?
Do NDX Ground Ops or GTP API Gravity Calculator2 have ads?
Which is updated more often, NDX Ground Ops or GTP API Gravity Calculator2?
Other comparisons
