# WBAT Mobile vs GTP API Gravity Calculator2

The clearest difference is review sentiment: GTP API Gravity Calculator2 at 100% against WBAT Mobile's 0%. GTP API Gravity Calculator2 also leads on chart position (#193 vs unranked) and iOS requirement (12.0 vs 15.1). WBAT Mobile's advantage is price (Free vs $9.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

WBAT Mobile 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.

WBAT Mobile ships an update every 3 months, GTP API Gravity Calculator2 every 2 months. The most recent releases landed on August 21, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | WBAT Mobile | 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 | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#193** |
| Size | 23 MB | 9 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [UTRS, Inc](https://appshunter.io/developer/1253459967) | [Gammon Technical Products](https://appshunter.io/developer/1163782116) |

## What reviewers say

### WBAT Mobile

[App page](https://appshunter.io/ios/app/wbat-mobile/id1253459968)

This app enables authorized users to create, save, and submit safety reports for their organization's safety programs directly from a mobile device. It supports various report types including ASAP, FRAT, LOSA, and incident reports, and allows users to view safety notices and messages.

**Highlights:** Create safety reports on mobile, Submit reports from anywhere, Supports ASAP, FRAT, LOSA, incident reports, View safety notices and newsletters, Send and receive WBAT messages

**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 WBAT Mobile free?

WBAT Mobile 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 WBAT Mobile or GTP API Gravity Calculator2 have ads?

Neither WBAT Mobile nor GTP API Gravity Calculator2 shows ads.

### Which is updated more often, WBAT Mobile or GTP API Gravity Calculator2?

WBAT Mobile ships an update every 3 months, and GTP API Gravity Calculator2 every 2 months. Most recently, WBAT Mobile was updated on August 21, 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.*