# Rad Tech Audio vs X

The clearest difference is price: X at Free against Rad Tech Audio's $107.99. X also leads on update cadence (every 4 months vs every 39 months) and iOS requirement (12.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

X is free to download; Rad Tech Audio costs $107.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rad Tech Audio ships an update every 39 months, X every 4 months. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Rad Tech Audio | X |
| --- | --- | --- |
| Price | $107.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 4 months** |
| Size | 214 MB | 79 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [RTS Publishing Co Inc](https://appshunter.io/developer/604916069) | [University of Oulu](https://appshunter.io/developer/1057902852) |

## What reviewers say

### Rad Tech Audio

[App page](https://appshunter.io/ios/app/rad-tech-audio/id6444367028)

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

**In-app purchases:** none


### X

[App page](https://appshunter.io/ios/app/x-ray-scatter-sim/id6463718894)

**In-app purchases:** none


## Frequently asked questions

### Is Rad Tech Audio free?

Rad Tech Audio costs $107.99, with no in-app purchases.

### Is X free?

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

### Do Rad Tech Audio or X have ads?

Neither Rad Tech Audio nor X shows ads.

### Which is updated more often, Rad Tech Audio or X?

Rad Tech Audio ships an update every 39 months, and X every 4 months. Most recently, Rad Tech Audio was updated on October 15, 2026 and X 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.*