uDisk vs DUO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
uDisk
Transform your iOS device into a portable USB drive. Easily transfer files between your device and computer via Wi-Fi or iTunes. Browse, play, and edit various file types directly on your phone or tablet.
- Use iOS device as USB disk
- Wi-Fi file transfer
- iTunes File Sharing
- Browse various file types
- Play music and video
- Edit text files
- Create directories and sort files
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Let your iOS device become a USB disk ! You can use it to transfer files between iOS device and computer by Wifi or iTunes File Sharing. The uDisk support various files browse, music and video play, and text file editing. Tap the toolbar buttons you can view the wifi address, create a directory, sort the files, and change the view mode. Long press the file item, you can move, rename, email and delete the file. Enjoy it ! If any question and suggestion, please contact czh0766@163.com.
DUO
This multi-functional storage device offers a dual connector for seamless file transfer and management between Apple devices and computers. It allows for backing up contacts, streaming high-definition videos, and managing files directly from the device.
- Dual USB and Lightning connectors
- Contact backup and restore
- Independent music and video playback
- 1080p video streaming
- File management (copy, delete, export)
- Browse external and local files
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DUO-LINK 3 is a multi-functional storage device for Mac, PC, iPad, iPhone, and iPod touch. DUO-LINK 3 has a standard USB interface and a lightning connector for iPhone and iPad. Free up space on your iPhone and iPad. Transfer and share files between your iPhone, iPad & Mac or PC quickly and easily. DUO-LINK 3 Functions： ● Contact list backup and restore. ● Supports independent music and video playback. ● Stream 1080p videos directly from DUO-LINK 3. ● File management operations such as copy, delete, export etc. ● Browse files store on DUO-LINK 3 Drive. ● Browse local files stored within DUO-LINK 3 App. ● Transfer media and files from iPhone to DUO-LINK 3 Drive. Compatibility： ● IOS 9 and older versions. Compatible with : iPhone 6 Plus, iPad 4th Generation and older devices. ● PCs running Windows XP, Windows 7, and Windows 8. ● Mac computers running Mac OS 10.5 or later.
Screenshots
Verdict
The clearest difference is review sentiment: uDisk at 84% against DUO's 18%. uDisk also leads on rating (4.3 vs 2.5). DUO's advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 11.0). On price, ratings volume, update cadence and ads 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
Both are free to download. uDisk sells 1 one-off in-app purchase. DUO asks for nothing beyond the download.
uDisk holds the better App Store score, 4.3 against 2.5. Both are backed by a comparable volume of ratings — 247 and 86 respectively. Written reviews point the same way: 84% of uDisk's written reviews are positive against 18% of DUO's.
uDisk ships an update every 2 months, DUO every 3 months. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.
| Parameter | uDisk | DUO |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (247 ratings) — better | 2.5 (86 ratings) |
| Positive reviews | 83.8% of reviews — better | 17.5% of reviews |
| Number of ratings | 247 — better | 86 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 20 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen Brown Bear Technology Co., LTD | Gopod Group Limited |
Customer experience
uDisk
DUO
User reviews
uDisk
From 247 App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Fast transfer
- 👍 Good for organizing files
- 👍 Useful for freeing up phone space
- 👍 Versatile and durable
Room to improve
- 🐛 Does not work for some users
- 🐛 App requires download to each device
- 🐛 Cannot rotate screen
- 🐛 Does not work as a standalone flash drive
- 🐛 Limited file transfer capability
DUO
From 86 App Store ratingsWhat we love
- ✅ Easy file transfer between devices
- 📱 Works with multiple iOS devices
- 🎵 Can store and play media files
- 💾 Provides additional storage capacity
- 🔄 Simple backup functionality for photos/videos
Room to improve
- 🐛 Frequent app crashes and freezes
- ❌ Incompatible with newer iPhone models
- 📉 Poor app stability after updates
- 🔌 Hardware not recognized by app
- 💥 Data loss issues reported
Bugs and requests
uDisk
Reported bugs
6 issues- Cannot save files manually
- Material does not always show
- Does not work after initial use
- Cannot rotate screen
- Does not transfer videos from phone
Show 1 moreShow fewer
- No permissions requested for file access
Requested features
2 requests- App should be pre-loaded on the thumbdrive
- More clarity on app functionality and safety
DUO
Reported bugs
21 issues- App crashes when playing MP3 files
- App crashes when transferring large files
- App crashes when viewing videos
- App crashes when adjusting volume during video playback
- App crashes when copying photos
Show 16 moreShow fewer
- App crashes after 15-20 seconds of use
- Cannot recognize iPhone 8, iPhone X, iPhone 14, iPhone 16 Pro
- Hardware not detected despite proper connection
- Files show as transferred but remain on device
- Duplicate file errors during transfer
- File names corrupted with special characters
- Cannot delete files after transfer
- App closes when opening audio files
- Cannot access audio files after update
- App bloats to 1-2GB after initial use
- Incompatible with iOS 11 and later versions
- LED light not activating on connection
- Chinese language files appearing unexpectedly
- Cannot read flash drive after disconnect/reconnect
- File transfer progress not completing despite appearing to work
- Photos not visible in app despite being on device
Requested features
15 requests- Video thumbnail preview functionality
- File sharing with other applications
- Password/file locking capability
- Ability to select multiple files in view mode
- Wireless streaming to Apple TV
Show 10 moreShow fewer
- Root folder naming per device
- Ability to rename files on iPhone
- Create folders and organize files
- App storage on external drive
- Better PDF reader for stored files
- Fast forward/rewind for audio/video
- Playback resume from last location
- Bookmark functionality for media
- Live photo support
- Document transfer capability
In-app purchases
uDisk
- Pro Version$3.99
DUO
No in-app purchases
