U vs PDF Diet
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
U
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.
- Two-shake access
- Stores multiple keys
- Independent facility use
- U-Prox brand style interface
- Easy usability
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U-Prox Mobile ID is used to get two-shake access to the area secured by U-Prox family access controllers. The application stores more than one key - it makes possible to use U-Prox Mobile ID in independent facilities. U-Prox brand style interface makes the application usability as easy as it possible.
PDF Diet
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Shrink a PDF before you email it or upload it from your iPhone or iPad. Open a scanned form, a report with photos, or another large PDF from Files. PDF Diet compresses it right on your device, so you can work offline. Find the right file size Choose Light, Medium, High, or Strong. Check the file size for each preset and compare the original and compressed pages in a synchronized preview. See what changed before you share. Keep documents readable PDF Diet checks what’s inside the document. On supported PDFs, it can recompress embedded images while keeping text and vector graphics sharp. Results depend on what’s in the file. Clean up a copy Delete unwanted pages or choose which details to remove, including author metadata, comments, bookmarks, attachments, and links. Save to Files or share Export a separate copy and keep your original intact. Save the result to Files or send it through the share sheet with Mail, Messages, or AirDrop.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | U | PDF Diet |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.8 (27 ratings) — better | — |
| Positive reviews | 18.2% of reviews | — |
| Number of ratings | 27 — better | — |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.1 |
| Further details — not scored | ||
| Size | 85 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | a2softin | Artem Svitelskyi |
In-app purchases
U
No in-app purchases
PDF Diet
No in-app purchases









