# Gas Turbines vs Pilot Mental Math

The clearest difference is price: Pilot Mental Math at Free against Gas Turbines's $9.99. Pilot Mental Math also leads on rating (5.0 vs 3.5) and update cadence (weekly vs every 43 months). Gas Turbines's advantage is in-app purchases (none vs 2) and device support (3 vs 1). On ratings volume and ads there is nothing between them.

Pilot Mental Math is free to download; Gas Turbines costs $9.99 up front. Pilot Mental Math sells 2 in-app purchases, starting at $2.99 per month. Gas Turbines asks for nothing beyond the download.

Pilot Mental Math holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Gas Turbines ships an update every 43 months, Pilot Mental Math weekly. The most recent releases landed on October 22, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Gas Turbines | Pilot Mental Math |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/gas-turbines/id1210385891/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pilot-mental-math/id6756044530/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 43 months | **Weekly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 225 MB | 4 MB |
| Requires iOS | **17.4** | 26.1 |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Padpilot Limited](https://appshunter.io/developer/413253261) | [Patrick Grauel](https://appshunter.io/developer/1855338187) |

## What reviewers say

### Gas Turbines

[App page](https://appshunter.io/ios/app/gas-turbines/id1210385891)

Explore the design, construction, and function of a modern triple spool gas turbine engine through interactive 3D models. This educational tool provides a foundational understanding for aspiring aviation professionals and a refresher for experienced ones.

**Highlights:** Interactive 3D gas turbine engine model, Component visualization and animation, Detailed summaries of design and construction, Identification of threats and errors, Unique navigation wheels for engine assembly, Foundational ATPL theory learning

**Features:** Vision Pro support

**In-app purchases:** none


### Pilot Mental Math

[App page](https://appshunter.io/ios/app/pilot-mental-math/id6756044530)

This app simulates acoustic mental math tests used by airlines for pilot screening. It focuses on auditory memory and calculation under time pressure, offering adaptive difficulty and custom training parameters.

**Highlights:** Acoustic simulation of spoken equations, Adaptive difficulty levels, Customizable training parameters, Exam mode with hidden timer, Performance tracking and analytics, Multiple language support

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Lifetime | $6.99 | one-time |


## Frequently asked questions

### Is Gas Turbines free?

Gas Turbines costs $9.99, with no in-app purchases.

### Is Pilot Mental Math free?

Pilot Mental Math is free to download, with in-app purchases available.

### Which has better reviews, Gas Turbines or Pilot Mental Math?

Pilot Mental Math is rated higher. Gas Turbines averages 3.5 out of 5 from 2 ratings, while Pilot Mental Math averages 5.0 from 2 ratings.

### Do Gas Turbines or Pilot Mental Math have ads?

Neither Gas Turbines nor Pilot Mental Math shows ads.

### Which is updated more often, Gas Turbines or Pilot Mental Math?

Gas Turbines ships an update every 43 months, and Pilot Mental Math weekly. Most recently, Gas Turbines was updated on October 22, 2026 and Pilot Mental Math on October 5, 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.*