# u vs WorldScratch

The clearest difference is in-app purchases: WorldScratch at none against u's 2. WorldScratch also leads on update cadence (every 2 days vs every 3 weeks). u's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. u sells 2 in-app purchases, starting at $12.99 per month. WorldScratch asks for nothing beyond the download.

u ships an update every 3 weeks, WorldScratch every 2 days. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | u | WorldScratch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/u-sim/id6476834207/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 100 MB | 33 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Tom Fadial](https://appshunter.io/developer/1316852248) | [Rafael shavit](https://appshunter.io/developer/6774268014) |

## What reviewers say

### u

[App page](https://appshunter.io/ios/app/u-sim/id6476834207)

Engage in dynamic medical simulations powered by AI. Input a complaint or topic to generate a realistic patient scenario. Practice diagnostic and treatment skills with interactive feedback and learning resources.

**Highlights:** AI-generated dynamic simulation scenarios, Interactive patient case progression, Request diagnostic tests and consultations, Detailed feedback and learning points, On-demand medical training

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $12.99 | per month |
| 20 Pack | $29.99 | one-time |


### WorldScratch

[App page](https://appshunter.io/ios/app/worldscratch-travel-map/id6790943677)

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

**In-app purchases:** none


## Frequently asked questions

### Is u free?

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

### Is WorldScratch free?

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

### Do u or WorldScratch have ads?

WorldScratch shows ads; u does not.

### Which is updated more often, u or WorldScratch?

u ships an update every 3 weeks, and WorldScratch every 2 days. Most recently, u was updated on October 2, 2026 and WorldScratch on October 1, 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.*