# ExpertGuidance vs X

The clearest difference is iOS requirement: X at 12.0 against ExpertGuidance's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

ExpertGuidance ships an update every 3 months, X every 4 months. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ExpertGuidance | X |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Size | 573 MB | 79 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Siemens Healthineers AG](https://appshunter.io/developer/1726357092) | [University of Oulu](https://appshunter.io/developer/1057902852) |

## What reviewers say

### ExpertGuidance

[App page](https://appshunter.io/ios/app/expertguidance/id1505323191)

**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 ExpertGuidance free?

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

### Is X free?

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

### Do ExpertGuidance or X have ads?

Neither ExpertGuidance nor X shows ads.

### Which is updated more often, ExpertGuidance or X?

ExpertGuidance ships an update every 3 months, and X every 4 months. Most recently, ExpertGuidance was updated on October 25, 2026 and X on October 27, 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.*