# DA40 NG vs Subtraction Math Trainer

The clearest difference is price: Subtraction Math Trainer at $2.99 against DA40 NG's $19.99. Subtraction Math Trainer also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.0). DA40 NG's advantage is update cadence (every 4 months vs every 34 months). On ads and in-app purchases there is nothing between them.

DA40 NG costs $19.99 and Subtraction Math Trainer $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DA40 NG ships an update every 4 months, Subtraction Math Trainer every 34 months. The most recent releases landed on October 11, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | DA40 NG | Subtraction Math Trainer |
| --- | --- | --- |
| Price | $19.99 | **$2.99** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/da40-ng/id662106657/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 34 months |
| Monetization | Paid | — |
| Size | 35 MB | 18 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gyronimo, LLC](https://appshunter.io/developer/536898885) | [Sergey Malugin](https://appshunter.io/developer/562782409) |

## What reviewers say

### DA40 NG

[App page](https://appshunter.io/ios/app/da40-ng/id662106657)

This app calculates mass, balance, and performance data for the Diamond DA40 NG aircraft. It helps pilots plan flights quickly by interpolating data from the Pilot's Operating Handbook, offering detailed graphics and scenario planning.

**Highlights:** Mass & Balance calculations, Takeoff and Landing performance, Climb performance analysis, Cruise performance optimization, Fuel management and efficiency, Wind component calculation, Scenario planning with sliders

**In-app purchases:** none


### Subtraction Math Trainer

[App page](https://appshunter.io/ios/app/subtraction-math-trainer/id1197851863)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DA40 NG free?

DA40 NG costs $19.99, with no in-app purchases.

### Is Subtraction Math Trainer free?

Subtraction Math Trainer costs $2.99, with no in-app purchases.

### Do DA40 NG or Subtraction Math Trainer have ads?

Neither DA40 NG nor Subtraction Math Trainer shows ads.

### Which is updated more often, DA40 NG or Subtraction Math Trainer?

DA40 NG ships an update every 4 months, and Subtraction Math Trainer every 34 months. Most recently, DA40 NG was updated on October 11, 2026 and Subtraction Math Trainer 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.*