# GL vs GTP API Gravity Calculator2

The clearest difference is price: GL at Free against GTP API Gravity Calculator2's $9.99. GTP API Gravity Calculator2's advantage is chart position (#186 vs unranked) and iOS requirement (12.0 vs 18.0). On ads, in-app purchases and device support there is nothing between them.

GL 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.

## The numbers

| Metric | GL | GTP API Gravity Calculator2 |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/gtp-api-gravity-calculator2/id6742924006/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 2 months |
| Monetization | — | Paid |
| Best chart rank | — | **#186** |
| Size | 10 MB | 9 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gunter Van Hauwe](https://appshunter.io/developer/1653381683) | [Gammon Technical Products](https://appshunter.io/developer/1163782116) |

## What reviewers say

### GL

[App page](https://appshunter.io/ios/app/gl-configurator/id6739363180)

**In-app purchases:** none


### GTP API Gravity Calculator2

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

**Currently charting:** #186 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 GL free?

GL 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.

### Do GL or GTP API Gravity Calculator2 have ads?

Neither GL nor GTP API Gravity Calculator2 shows ads.

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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.*