# Measurement Calculators vs GTP API Gravity Calculator2

The clearest difference is price: Measurement Calculators at Free against GTP API Gravity Calculator2's $9.99. Measurement Calculators also leads on rating (5.0 vs 4.0) and ratings volume (3 vs 1). GTP API Gravity Calculator2's advantage is update cadence (every 2 months vs every 6 months). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Measurement Calculators 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.

Measurement Calculators holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Measurement Calculators ships an update every 6 months, GTP API Gravity Calculator2 every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Measurement Calculators | GTP API Gravity Calculator2 |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/measurement-calculators/id1571559322/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/gtp-api-gravity-calculator2/id6742924006/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 0 MB | 9 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kyle Walker](https://appshunter.io/developer/1571559324) | [Gammon Technical Products](https://appshunter.io/developer/1163782116) |

## What reviewers say

### Measurement Calculators

[App page](https://appshunter.io/ios/app/measurement-calculators/id1571559322)

Perform essential calculations directly on your mobile device, eliminating the need for a computer. This app provides a convenient tool for on-the-go measurements and office tasks.

**Highlights:** In-field calculations, Office calculations, Computer-free operation, Convenient mobile tool

**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 Measurement Calculators free?

Measurement Calculators 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, Measurement Calculators or GTP API Gravity Calculator2?

Measurement Calculators is rated higher. Measurement Calculators averages 5.0 out of 5 from 3 ratings, while GTP API Gravity Calculator2 averages 4.0 from 1 ratings.

### Do Measurement Calculators or GTP API Gravity Calculator2 have ads?

Neither Measurement Calculators nor GTP API Gravity Calculator2 shows ads.

### Which is updated more often, Measurement Calculators or GTP API Gravity Calculator2?

Measurement Calculators ships an update every 6 months, and GTP API Gravity Calculator2 every 2 months. Most recently, Measurement Calculators was updated on October 24, 2026 and GTP API Gravity Calculator2 on October 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.*