# Fuel Density Calculation vs GTP API Gravity Calculator2

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.

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 October 5, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Fuel Density Calculation | GTP API Gravity Calculator2 |
| --- | --- | --- |
| Price | **$2.99** | $9.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fuel-density-calculation/id6636469810/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/gtp-api-gravity-calculator2/id6742924006/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 9 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Richard Montoya](https://appshunter.io/developer/1762752434) | [Gammon Technical Products](https://appshunter.io/developer/1163782116) |

## What reviewers say

### Fuel Density Calculation

[App page](https://appshunter.io/ios/app/fuel-density-calculation/id6636469810)

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.

**Highlights:** Fuel density calculations, Compare uploaded vs. actual fuel, Designed for Boeing and Airbus aircrews, Accurate fuel on board (FOB) verification

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

**In-app purchases:** none


### GTP API Gravity Calculator2

[App page](https://appshunter.io/ios/app/gtp-api-gravity-calculator2/id6742924006)

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.

**Highlights:** Corrected API gravity calculation, Total fuel weight calculation, Supports jet, gasoline, and diesel fuels, Digital version of slide calculators, Developed in 2025

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

**In-app purchases:** none


## Frequently asked questions

### Is Fuel Density Calculation free?

Fuel Density Calculation costs $2.99, with no in-app purchases.

### Is GTP API Gravity Calculator2 free?

GTP API Gravity Calculator2 costs $9.99, with no in-app purchases.

### Which has better reviews, Fuel Density Calculation or GTP API Gravity Calculator2?

Fuel Density Calculation is rated higher. Fuel Density Calculation averages 5.0 out of 5 from 2 ratings, while GTP API Gravity Calculator2 averages 4.0 from 1 ratings.

### Do Fuel Density Calculation or GTP API Gravity Calculator2 have ads?

Neither Fuel Density Calculation nor GTP API Gravity Calculator2 shows ads.

### Which is updated more often, Fuel Density Calculation or GTP API Gravity Calculator2?

Fuel Density Calculation ships an update every 2 months, and GTP API Gravity Calculator2 every 2 months. Most recently, Fuel Density Calculation was updated on October 5, 2026 and GTP API Gravity Calculator2 on September 24, 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.*