# NDT Master vs Euler Gamma

The clearest difference is in-app purchases: Euler Gamma at none against NDT Master's 1. NDT Master's advantage is iOS requirement (15 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. NDT Master sells 1 one-off in-app purchase. Euler Gamma asks for nothing beyond the download.

NDT Master ships an update every 2 weeks, Euler Gamma every 9 days. The most recent releases landed on October 15, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | NDT Master | Euler Gamma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/ndt-master-ut-weld-calculator/id6762549446/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 14 MB |
| Requires iOS | **15** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [雪 蔺](https://appshunter.io/developer/1853712836) | [音 卢](https://appshunter.io/developer/1895433682) |

## What reviewers say

### NDT Master

[App page](https://appshunter.io/ios/app/ndt-master-ut-weld-calculator/id6762549446)

This app streamlines ultrasonic testing for field inspections. It offers rapid weld rating, DAC/TCG curve building, 3D beam simulation, and OCR parameter capture. Includes essential UT calculators and material presets for efficient flaw detection and setup confidence.

**Highlights:** AWS D-Rating in 5 Seconds, DAC/TCG Curve Building, 3D Beam Simulation, OCR Parameter Capture, 9 UT Calculators, Offline-First Workflow

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional Unlock | $9.99 | one-time |


### Euler Gamma

[App page](https://appshunter.io/ios/app/euler-gamma-ndt-calculator/id6772123721)

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

**In-app purchases:** none


## Frequently asked questions

### Is NDT Master free?

NDT Master is free to download, with in-app purchases available.

### Is Euler Gamma free?

Euler Gamma is free to download, with no in-app purchases.

### Do NDT Master or Euler Gamma have ads?

Neither NDT Master nor Euler Gamma shows ads.

### Which is updated more often, NDT Master or Euler Gamma?

NDT Master ships an update every 2 weeks, and Euler Gamma every 9 days. Most recently, NDT Master was updated on October 15, 2026 and Euler Gamma on September 25, 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.*