# NDT Toolbox vs Euler Gamma

The clearest difference is update cadence: Euler Gamma at every 9 days against NDT Toolbox's every 4 months. NDT Toolbox's advantage is iOS requirement (14.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NDT Toolbox ships an update every 4 months, Euler Gamma every 9 days. The most recent releases landed on September 21, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | NDT Toolbox | Euler Gamma |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 9 days** |
| Size | 74 MB | 14 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Muzaffer Sanli](https://appshunter.io/developer/1817503295) | [音 卢](https://appshunter.io/developer/1895433682) |

## What reviewers say

### NDT Toolbox

[App page](https://appshunter.io/ios/app/ndt-toolbox/id6749625848)

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

**In-app purchases:** none


### 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 Toolbox free?

NDT Toolbox is free to download, with no in-app purchases.

### Is Euler Gamma free?

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

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

Neither NDT Toolbox nor Euler Gamma shows ads.

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

NDT Toolbox ships an update every 4 months, and Euler Gamma every 9 days. Most recently, NDT Toolbox was updated on September 21, 2026 and Euler Gamma on September 9, 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.*