# U vs PDF Diet

The clearest difference is price: U at Free against PDF Diet's $1.99. PDF Diet's advantage is update cadence (every 10 days vs every 2 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

U is free to download; PDF Diet costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

U ships an update every 2 months, PDF Diet every 10 days. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | U | PDF Diet |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.8 (27 ratings)](https://appshunter.io/ios/app/u-prox-mobile-id/id1148060309/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | 18.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 85 MB | 3 MB |
| Requires iOS | **16.0** | 17.1 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [a2softin](https://appshunter.io/developer/1133492162) | [Artem Svitelskyi](https://appshunter.io/developer/1892488801) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-prox-mobile-id/id1148060309)

This application provides secure, two-shake access to areas protected by U-Prox access controllers. It can store multiple keys, allowing for use in various independent locations with an easy-to-use interface.

**Highlights:** Two-shake access, Stores multiple keys, Independent facility use, U-Prox brand style interface, Easy usability

**Features:** macOS Compatibility, Apple Wallet, Apple Watch app, Vision Pro support

**In-app purchases:** none


### PDF Diet

[App page](https://appshunter.io/ios/app/pdf-diet-document-optimizer/id6763309217)

**In-app purchases:** none


## Frequently asked questions

### Is U free?

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

### Is PDF Diet free?

PDF Diet costs $1.99, with no in-app purchases.

### Do U or PDF Diet have ads?

Neither U nor PDF Diet shows ads.

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

U ships an update every 2 months, and PDF Diet every 10 days. Most recently, U was updated on November 11, 2026 and PDF Diet on November 10, 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.*