Fuel Density Calculation vs GTP API Gravity Calculator2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fuel Density Calculation
This utility app assists wide-body aircrews, specifically for Boeing and Airbus aircraft, in comparing uploaded fuel quantities with actual fuel on board. It incorporates density calculations for accurate fuel management.
- Fuel density calculations
- Compare uploaded vs. actual fuel
- Designed for Boeing and Airbus aircrews
- Accurate fuel on board (FOB) verification
Read full descriptionHide full description
Fuel Density Calculation is a cockpit utility for comparing receipt-based fuel uplift calculations against indicated fuel on board. Enter landing fuel, fuel density or specific gravity, fuel receipt quantities, and indicated FOB. The app calculates uplift, landing fuel plus uplift, and the resulting difference in both percent and pounds. Supports gallons and liters, automatic decimal formatting, and specific gravity conversion for receipts that provide SG instead of fuel density. This app is a calculation aid and does not replace approved aircraft, company, or maintenance procedures.
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
Read full descriptionHide full description
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 rating: Fuel Density Calculation at 5.0 against GTP API Gravity Calculator2's 4.0. Fuel Density Calculation also leads on price ($2.99 vs $9.99). GTP API Gravity Calculator2's advantage is iOS requirement (12.0 vs 17.0). On review sentiment, ratings volume, update cadence and ads 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
Fuel Density Calculation costs $2.99 and GTP API Gravity Calculator2 $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Fuel Density Calculation holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 17, 2026 and September 24, 2026 respectively.
| Parameter | Fuel Density Calculation | GTP API Gravity Calculator2 |
|---|---|---|
| Price | $2.99 — better | $9.99 |
| Rating | 5.0 (2 ratings) — better | 4.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Richard Montoya | Gammon Technical Products |
Customer experience
Fuel Density Calculation
GTP API Gravity Calculator2
In-app purchases
Fuel Density Calculation
No in-app purchases
GTP API Gravity Calculator2
No in-app purchases
Questions
Is Fuel Density Calculation free?
Is GTP API Gravity Calculator2 free?
Which has better reviews, Fuel Density Calculation or GTP API Gravity Calculator2?
Do Fuel Density Calculation or GTP API Gravity Calculator2 have ads?
Which is updated more often, Fuel Density Calculation or GTP API Gravity Calculator2?
Other comparisons
