# OilField Hydrostatic Pressure. vs Gammon API Gravity Calculator

The clearest difference is price: OilField Hydrostatic Pressure. at $0.99 against Gammon API Gravity Calculator's $9.99. Gammon API Gravity Calculator's advantage is chart position (#196 vs unranked) and iOS requirement (8.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

OilField Hydrostatic Pressure. costs $0.99 and Gammon API Gravity Calculator $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | OilField Hydrostatic Pressure. | Gammon API Gravity Calculator |
| --- | --- | --- |
| Price | **$0.99** | $9.99 |
| Rating | — | **[3.6 (10 ratings)](https://appshunter.io/ios/app/gammon-api-gravity-calculator/id1163782117/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | — |
| Monetization | — | Paid |
| Best chart rank | — | **#196** |
| Size | 1 MB | 10 MB |
| Requires iOS | 17.0 | **8.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [zhandos uakanov](https://appshunter.io/developer/625286817) | [Gammon Technical Products](https://appshunter.io/developer/1163782116) |

## What reviewers say

### OilField Hydrostatic Pressure.

[App page](https://appshunter.io/ios/app/oilfield-hydrostatic-pressure/id921528975)

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

**In-app purchases:** none


### Gammon API Gravity Calculator

[App page](https://appshunter.io/ios/app/gammon-api-gravity-calculator/id1163782117)

**Currently charting:** #196 Top Paid · Reference (US App Store)

Calculate corrected API gravity for jet, gasoline, and diesel fuels at 60°F. This digital tool also determines the total weight of the fuel, replicating the functionality of physical slide calculators.

**Highlights:** Corrected API gravity calculation, Fuel weight calculation, Supports jet, gasoline, and diesel fuels, Digital slide calculator replacement, Accurate at 60°F

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

**In-app purchases:** none


## Frequently asked questions

### Is OilField Hydrostatic Pressure. free?

OilField Hydrostatic Pressure. costs $0.99, with no in-app purchases.

### Is Gammon API Gravity Calculator free?

Gammon API Gravity Calculator costs $9.99, with no in-app purchases.

### Do OilField Hydrostatic Pressure. or Gammon API Gravity Calculator have ads?

Neither OilField Hydrostatic Pressure. nor Gammon API Gravity Calculator shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*