# X vs Euler Gamma

The clearest difference is update cadence: Euler Gamma at every 9 days against X's every 13 months. X's advantage is iOS requirement (8.0 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.

X ships an update every 13 months, Euler Gamma every 9 days. The most recent releases landed on September 29, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | X | Euler Gamma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (8 ratings)](https://appshunter.io/ios/app/x-ray-timer/id350390647/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 75.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 9 days** |
| Monetization | Paid | — |
| Size | 0 MB | 14 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lance Henderson](https://appshunter.io/developer/348247919) | [音 卢](https://appshunter.io/developer/1895433682) |

## What reviewers say

### X

[App page](https://appshunter.io/ios/app/x-ray-timer/id350390647)

Calculate radiography shot times for industrial radiographers using radioactive materials. Quickly determine exposure time by inputting curies, steel thickness, and source-to-film distance.

**Highlights:** Calculate radiography shot times, Supports Iridium and Cobalt sources, Input curies, thickness, and distance, Field-tested for accuracy, Replaces slide rule calculations

**Features:** macOS Compatibility

**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 X free?

X 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 X or Euler Gamma have ads?

Neither X nor Euler Gamma shows ads.

### Which is updated more often, X or Euler Gamma?

X ships an update every 13 months, and Euler Gamma every 9 days. Most recently, X was updated on September 29, 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.*