# 1200.aero vs GTP API Gravity Calculator2

The clearest difference is price: 1200.aero at Free against GTP API Gravity Calculator2's $9.99. 1200.aero also leads on update cadence (every 3 weeks vs every 2 months). GTP API Gravity Calculator2's advantage is chart position (#193 vs unranked) and iOS requirement (12.0 vs 15.1). On rating, ratings volume, ads and in-app purchases there is nothing between them.

1200.aero 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.

On the App Store both sit at effectively the same score — 4.0 for 1200.aero against 4.0 for GTP API Gravity Calculator2. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

1200.aero ships an update every 3 weeks, GTP API Gravity Calculator2 every 2 months. Both last shipped on September 8, 2026.

## The numbers

| Metric | 1200.aero | GTP API Gravity Calculator2 |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/1200aero/id6468972529/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 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#193** |
| Size | 41 MB | 9 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [1200.aero](https://appshunter.io/developer/1710769015) | [Gammon Technical Products](https://appshunter.io/developer/1163782116) |

## What reviewers say

### 1200.aero

[App page](https://appshunter.io/ios/app/1200aero/id6468972529)

This app enables airports and FBOs to monitor aircraft towing in real-time, calculate towing expenses, capture pre-tow images, and view aircraft parking locations on maps. It is designed for minimal user input and supports offline functionality.

**Highlights:** Real-time towing operation tracking, Quantify total towing expenses, Capture pre-tow pictures, View actual parking positions on maps, Minimal user input required, Offline operation support

**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)

**Currently charting:** #193 Top Paid · Utilities (US App Store)

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 1200.aero free?

1200.aero is free to download, 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, 1200.aero or GTP API Gravity Calculator2?

1200.aero and GTP API Gravity Calculator2 are both rated 4.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do 1200.aero or GTP API Gravity Calculator2 have ads?

Neither 1200.aero nor GTP API Gravity Calculator2 shows ads.

### Which is updated more often, 1200.aero or GTP API Gravity Calculator2?

1200.aero ships an update every 3 weeks, and GTP API Gravity Calculator2 every 2 months. Most recently, 1200.aero was updated on September 8, 2026 and GTP API Gravity Calculator2 on September 8, 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.*