Comparison

USB Disk SE, File Manager vs PrepDoc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

USB Disk SE, File Manager

This app allows you to store, view, and manage documents on your iPhone and iPad. It offers a built-in viewer, easy file transfers via iTunes, and integration with cloud storage services. Enjoy a simple interface with powerful features for organizing and accessing your files.

Highlights
  • Cloud storage integration (Dropbox, Google Drive, OneDrive, Box)
  • Store and view files on iPhone/iPod
  • Intuitive swipe navigation
  • File preview with thumbnails
  • Copy, paste, cut, delete, and create files
  • Email documents
  • USB file transfers
Features
Read full description

USB Disk lets you store, view and manage documents on your iPhone and iPad. It has an amazing built in document viewer and is very easy to use, with a simple and intuitive interface, yet it contains many powerful features. Drag and drop files in iTunes to transfer them to your iPhone / iPad, then view them anywhere! TUAW - "USB Disk is [...] a nicely designed one." Lifehacker - "The Best. USB Disk for iOS gives you a fast and easy way to transfer documents and images to your device." Apple - "New and Noteworthy" TOP REASONS TO BUY • Access Dropbox, Google Drive, OneDrive and Box. • Store and view files on your iPhone / iPod. • Navigate using swipes (like Photos / iBooks app). • Thumbnails let you preview your files. • Copy, paste, cut, delete and create files. MORE FEATURES • View and download email attachments. • Full screen file viewer. • USB file transfers. • Background audio. • Slideshow with adjustable delay. • Fast scrolling, page up/down functionalities. • Email your documents. SUPPORTED FILE TYPES • PDF files. • MS Office documents. • iWork documents. • Pictures (jpg, png, gif, ...). • eBooks (pdf, ePub, html, txt, ...). • Comics (cbr, cbz, pdf, ...). • Audio files (mp3, m4a, wav,...). • Video files (m4v, mov, avi, mkv, ...). UPDATES Buy now and get free updates. SUBSCRIPTION All features listed above can be used without an in app purchase. Some advanced features require an active subscription. These include: • Open and create zip files. • Adjust the audio mixer, use shuffle and repeat. • Access the device's photos library. • Protect the access to the app or specific files and folders with lock codes. • Access WebDAV and FTP servers. You can also configure SharePoint connections. • Edit simple text files. Also annotate PDF files. • Present files on external screens. Duration and price of each subscription are displayed in our storefront. All subscription costs will be charged to your Apple ID account, starting at the confirmation of purchase. Subscription automatically renews unless it is canceled at least 24 hours before the end of the subscription period. Your account will be charged for renewal within 24 hours prior to the end of the subscription period. It is not possible to cancel a subscription period once you have been charged for it. Any unused portion of a free trial period is forfeited as soon as a subscription is purchased. You can manage subscriptions and disable auto renewal by going to your account settings on the App Store after purchase. Terms of Service: https://imesart.com/legal/terms-of-service.php

About

PrepDoc

Features
Read full description

No subscription. Pay once and use PrepDoc forever. Scan, convert and sign documents in seconds with PrepDoc. PrepDoc is a powerful and easy-to-use document scanner that helps you turn paper documents, photos and ID cards into high-quality PDFs. Scan documents with your camera, convert images to PDF and sign files digitally in just a few taps. Whether you need to sign a contract, create a PDF from photos or quickly scan a document, PrepDoc makes the process fast and simple. Key Features • Scan documents using your camera • Convert photos and images to PDF instantly • Scan ID cards and automatically combine front and back sides • Sign documents with a digital signature • Import files from your device (PDF / images) • Share documents quickly • Access your recent documents anytime Perfect For • Signing contracts and agreements • Creating PDFs from photos • Scanning documents on the go • Creating ID card copies • Preparing and sharing forms Simple Pricing One-time payment. No subscription. Lifetime access. Pay once and use PrepDoc forever.

Screenshots

USB Disk SE, File Manager4 screens
PrepDoc4 screens

Verdict

The call

The clearest difference is price: USB Disk SE, File Manager at Free against PrepDoc's $2.99. USB Disk SE, File Manager also leads on device support (4 vs 1) and iOS requirement (16.0 vs 18.6). PrepDoc's advantage is in-app purchases (none vs 4) and ads (none vs shown).

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

USB Disk SE, File Manager is free to download; PrepDoc costs $2.99 up front. USB Disk SE, File Manager sells 4 in-app purchases, starting at $1.99 per 7 days. PrepDoc asks for nothing beyond the download.

UpkeepUpdate frequency

USB Disk SE, File Manager ships an update every 3 months, PrepDoc every 5 days. The most recent releases landed on October 13, 2026 and September 20, 2026 respectively.

Scorecard6 real differences · 4 level
USB Disk SE, File Manager versus PrepDoc: the parameters behind the verdict, then further details
ParameterUSB Disk SE, File ManagerPrepDoc
PriceFree — better$2.99
Rating4.4 (846 ratings) — better—
Positive reviews76.3% of reviews—
Number of ratings846 — better—
Update frequencyEvery 3 monthsEvery 5 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple TV, Apple Watch — betteriPhone
Requires iOS16.0 — better18.6
Further details — not scored
Size224 MB3 MB
Age rating4+4+
DeveloperImesart S.a.r.l.Ferkan Sari

Bugs and requests

USB Disk SE, File Manager

Reported bugs

3 issues
  • Crashes when opening certain file types
  • Syncing issues with iTunes
  • Compatibility problems with newer iOS versions

Requested features

4 requests
  • Ability to edit documents within the app
  • Improved file management with folders and renaming
  • Support for more file types
  • Wireless file transfer without iTunes

PrepDoc

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

USB Disk SE, File Manager

Subscriptions4
  • USB Disk Pro Weekly$1.997 Days
  • USB Disk Pro Monthly7 Days trial$4.991 Month
  • USB Disk Pro Half Yearly14 Days trial$19.996 Months
Show 1 more
  • USB Disk Pro Yearly1 Month trial$39.991 Year
None

PrepDoc

No in-app purchases

Questions

Is USB Disk SE, File Manager free?
USB Disk SE, File Manager is free to download, with in-app purchases available.
Is PrepDoc free?
PrepDoc costs $2.99, with no in-app purchases.
Do USB Disk SE, File Manager or PrepDoc have ads?
USB Disk SE, File Manager shows ads; PrepDoc does not.
Which is updated more often, USB Disk SE, File Manager or PrepDoc?
USB Disk SE, File Manager ships an update every 3 months, and PrepDoc every 5 days. Most recently, USB Disk SE, File Manager was updated on October 13, 2026 and PrepDoc on September 20, 2026.

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