# U vs Diet Challenge

The clearest difference is in-app purchases: U at none against Diet Challenge's 2. U also leads on iOS requirement (9.0 vs 15.0). Diet Challenge's advantage is update cadence (every 4 days vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Diet Challenge sells 2 in-app purchases, starting at $6.99 per month. U asks for nothing beyond the download.

U ships an update every 5 weeks, Diet Challenge every 4 days. The most recent releases landed on September 17, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | U | Diet Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Size | 293 MB | 23 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SMARTCHIP MICROELECTRONICS CORP.](https://appshunter.io/developer/872823142) | [Ahmet Muhammet Vural (AN)](https://appshunter.io/developer/1571264727) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-test/id1089459802)

**In-app purchases:** none


### Diet Challenge

[App page](https://appshunter.io/ios/app/diet-challenge/id6761604499)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $6.99 | per month |
| Annual Premium | $39.99 | per year |


## Frequently asked questions

### Is U free?

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

### Is Diet Challenge free?

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

### Do U or Diet Challenge have ads?

Neither U nor Diet Challenge shows ads.

### Which is updated more often, U or Diet Challenge?

U ships an update every 5 weeks, and Diet Challenge every 4 days. Most recently, U was updated on September 17, 2026 and Diet Challenge on September 22, 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.*