USB Mobile Disk vs QAS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
USB Mobile Disk
This app turns your iPhone or iPad into a portable storage device, allowing you to carry documents, music, and videos. It features a built-in file manager, music player, PDF reader, and supports various file transfer methods.
- Portable storage for iPhone/iPad
- Advanced file manager
- Background music player
- PDF reader
- Gallery import/export
- FTP and HTTP file access
- ZIP file creation/extraction
Read full descriptionHide full description
Carry all your documents, music, videos and any other data always with you. Store all your precious information in one secure place! This app transforms your iPhone & iPad to an advanced USB stick, full featured music player and even more: ▶ Use your iPhone and iPad as portable storage ▶ Advanced built-in file manager (rename, copy & paste, add folder, ...) ▶ Advanced background capable music player ▶ Advanced PDF reader ▶ Gallery import (photo and video) ▶ Gallery export (photo and video) ▶ Transfer downloaded files to your computer with iTunes ▶ Full FTP access to your files ▶ Full HTTP access to your downloads with your browser ▶ Send files by e-mail ▶ Receive files from other apps (e.g. e-mail attachments) ▶ Open files with other apps (e.g. Dropbox) ▶ Watch movies offline and listen to your music ▶ Preview and read documents (PDF Viewer) ▶ Create and extract ZIP-files ▶ Print documents using AirPrint ▶ Universal iPad / iPhone app ▶ HD / Retina support ▶▶▶ Have your USB stick always with you! The following file types are compatible with the built-in viewer. MOVIE FORMATS: Apple QuickTime (.mov), MPEG-4 (.mp4), m4v, 3GPP (.3gp) AUDIO FORMATS: MPEG-4 Advanced Audio Coding (.aac), Apple Lossless (.m4a) MPEG-1 audio layer 3 (.mp3), Waveform (.wav) DOCUMENT FORMATS: Excel (.xls), Keynote (.key.zip), Keynote '09 (.key), Numbers (.numbers.zip), Numbers '09 (.numbers), Pages (.pages.zip), Pages '09 (.pages), PDF (.pdf), Powerpoint (.ppt), Word (.doc), Rich Text Format (.rtf), Rich Text Format Directory (.rtfd.zip), Text (.txt), HTML (.htm/.html) IMAGE FORMATS: JPEG (.jpg/jpeg), Portable Network Graphics (.png), Graphics Interchange Format (.gif)
QAS
Control up to 8 speakers individually on your iPhone or iPad to play music from your library or online streaming services. Enjoy synchronized music across multiple rooms or play different songs in each.
- Individual speaker control
- Multiroom audio synchronization
- Music library playback
- Online streaming service integration
- Control up to 8 speakers
Read full descriptionHide full description
Per iPhone u. iPad steuern Sie auf bis zu 8 Lautsprechern individuell, was Sie hören. Neben Ihrer Musik-Bibliothek genießen Sie auf Wunsch auch Musik von verschiedenen Online-Streaming-Diensten. Statten Sie Wohnzimmer, Schlafzimmer, Küche und weitere Räume mit jeweils eigenen Lautsprechern aus. Schon hören Sie aus allen Räumen synchron Ihre Lieblingsmusik. Oder aus jedem Raum einen anderen Song. Multiroom macht's möglich!
Screenshots
Verdict
The clearest difference is review sentiment: USB Mobile Disk at 63% against QAS's 14%. USB Mobile Disk also leads on update cadence (every 3 months vs every 13 months). QAS's advantage is price (Free vs $0.99) and ads (none vs shown). On in-app purchases and device support 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
QAS is free to download; USB Mobile Disk costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
USB Mobile Disk ships an update every 3 months, QAS every 13 months. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.
| Parameter | USB Mobile Disk | QAS |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.3 (10 ratings) — better | — |
| Positive reviews | 62.5% of reviews — better | 14.3% of reviews |
| Number of ratings | 10 — better | — |
| Update frequency | Every 3 months — better | Every 13 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 28 MB | 146 MB |
| Age rating | 4+ | 4+ |
| Developer | Raphael Odermatt | PEARL. GmbH |
Customer experience
USB Mobile Disk
QAS
In-app purchases
USB Mobile Disk
No in-app purchases
QAS
No in-app purchases









