# GTP API Gravity Calculator2 vs Flite Log Pro

The clearest difference is price: Flite Log Pro at Free against GTP API Gravity Calculator2's $9.99. Flite Log Pro also leads on rating (5.0 vs 4.0) and update cadence (every 3 weeks vs every 2 months). GTP API Gravity Calculator2's advantage is in-app purchases (none vs 4) and ads (none vs shown). On ratings volume and device support there is nothing between them.

Flite Log Pro is free to download; GTP API Gravity Calculator2 costs $9.99 up front. Flite Log Pro sells 4 in-app purchases, starting at $4.99 per month. GTP API Gravity Calculator2 asks for nothing beyond the download.

Flite Log Pro holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

GTP API Gravity Calculator2 ships an update every 2 months, Flite Log Pro every 3 weeks. The most recent releases landed on September 8, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | GTP API Gravity Calculator2 | Flite Log Pro |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/gtp-api-gravity-calculator2/id6742924006/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flite-log-pro/id6743373878/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#193** | — |
| Size | 9 MB | 54 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gammon Technical Products](https://appshunter.io/developer/1163782116) | [Flite Log LLC](https://appshunter.io/developer/1802495942) |

## What reviewers say

### 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


### Flite Log Pro

[App page](https://appshunter.io/ios/app/flite-log-pro/id6743373878)

Streamline flight logging with this aviation tool. Easily record flight time by scanning QR codes, track aircraft maintenance, and manage pilot profiles. Ideal for individual pilots, clubs, and flight schools, it works offline and syncs data automatically.

**Highlights:** QR code flight logging, Automatic Hobbs and Tach updates, Maintenance and squawk tracking, Pilot profiles and flight summaries, Club and school management tools, Offline data storage and syncing

**Features:** Apple Wallet

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flite Log - Solo Monthly | $4.99 | per month |
| Flite Log Club - Monthly | $19.99 | per month |
| Flite Log - Solo Annual | $54.99 | per year |
| Club - Annual | $219.99 | per year |


## Frequently asked questions

### Is GTP API Gravity Calculator2 free?

GTP API Gravity Calculator2 costs $9.99, with no in-app purchases.

### Is Flite Log Pro free?

Flite Log Pro is free to download, with in-app purchases available.

### Which has better reviews, GTP API Gravity Calculator2 or Flite Log Pro?

Flite Log Pro is rated higher. GTP API Gravity Calculator2 averages 4.0 out of 5 from 1 ratings, while Flite Log Pro averages 5.0 from 1 ratings.

### Do GTP API Gravity Calculator2 or Flite Log Pro have ads?

Flite Log Pro shows ads; GTP API Gravity Calculator2 does not.

### Which is updated more often, GTP API Gravity Calculator2 or Flite Log Pro?

GTP API Gravity Calculator2 ships an update every 2 months, and Flite Log Pro every 3 weeks. Most recently, GTP API Gravity Calculator2 was updated on September 8, 2026 and Flite Log Pro on June 1, 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.*