# Gas Turbines vs Training Notes

The clearest difference is price: Training Notes at Free against Gas Turbines's $9.99. Training Notes also leads on update cadence (daily vs every 43 months) and iOS requirement (9.0 vs 17.4). On ads, in-app purchases and device support there is nothing between them.

Training Notes is free to download; Gas Turbines costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Gas Turbines ships an update every 43 months, Training Notes daily. Both last shipped on October 5, 2026.

## The numbers

| Metric | Gas Turbines | Training Notes |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[3.5 (2 ratings)](https://appshunter.io/ios/app/gas-turbines/id1210385891/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 43 months | **Daily** |
| Monetization | Paid | — |
| Size | 225 MB | 15 MB |
| Requires iOS | 17.4 | **9.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Padpilot Limited](https://appshunter.io/developer/413253261) | [British Aviation Academy](https://appshunter.io/developer/1569971459) |

## 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


### Training Notes

[App page](https://appshunter.io/ios/app/training-notes/id1569971457)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gas Turbines free?

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

### Is Training Notes free?

Training Notes is free to download, with no in-app purchases.

### Do Gas Turbines or Training Notes have ads?

Neither Gas Turbines nor Training Notes shows ads.

### Which is updated more often, Gas Turbines or Training Notes?

Gas Turbines ships an update every 43 months, and Training Notes daily. Most recently, Gas Turbines was updated on October 5, 2026 and Training Notes 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.*