# USB Sharp vs DUO

The clearest difference is review sentiment: USB Sharp at 63% against DUO's 18%. USB Sharp also leads on rating (3.1 vs 2.5) and update cadence (every 3 weeks vs every 3 months). DUO's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. USB Sharp sells 6 one-off in-app purchases. DUO asks for nothing beyond the download.

USB Sharp holds the better App Store score, 3.1 against 2.5. Both are backed by a comparable volume of ratings — 18 and 86 respectively. Written reviews point the same way: 63% of USB Sharp's written reviews are positive against 18% of DUO's.

USB Sharp ships an update every 3 weeks, DUO every 3 months. Both last shipped on October 17, 2026.

## The numbers

| Metric | USB Sharp | DUO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (18 ratings)](https://appshunter.io/ios/app/usb-sharp/id427762463/reviews)** | [2.5 (86 ratings)](https://appshunter.io/ios/app/duo-link-30/id1088185359/reviews) |
| Number of ratings | 18 | **86** |
| Positive reviews | **62.9% of reviews** | 17.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 55 MB | 34 MB |
| Requires iOS | 13.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [锦文 游](https://appshunter.io/developer/406832160) | [Gopod Group Limited](https://appshunter.io/developer/975108489) |

## What reviewers say

### USB Sharp

[App page](https://appshunter.io/ios/app/usb-sharp/id427762463)

Transform your iPhone or iPad into a portable wireless storage disk for efficient file management. Upload multiple files via Chrome and Firefox, extract encrypted RAR archives, and organize documents, photos, and videos with ease.

**Highlights:** Portable wireless storage, File management, Multiple file upload, Encrypted archive extraction, Document reader, Photo viewer, Video player

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $0.99 | one-time |
| Music Player | $0.99 | one-time |
| Dropbox | $0.99 | one-time |
| Video Player | $0.99 | one-time |
| SkyDrive | $0.99 | one-time |
| Full Version | $2.99 | one-time |


### DUO

[App page](https://appshunter.io/ios/app/duo-link-30/id1088185359)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✅ 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

**What reviewers complain about**

- 🐛 Frequent app crashes and freezes
- ❌ Incompatible with newer iPhone models
- 📉 Poor app stability after updates
- 🔌 Hardware not recognized by app
- 💥 Data loss issues reported

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked questions

### Is USB Sharp free?

USB Sharp is free to download, with in-app purchases available.

### Is DUO free?

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

### Which has better reviews, USB Sharp or DUO?

USB Sharp is rated higher. USB Sharp averages 3.1 out of 5 from 18 ratings, while DUO averages 2.5 from 86 ratings.

### Do USB Sharp or DUO have ads?

USB Sharp shows ads; DUO does not.

### Which is updated more often, USB Sharp or DUO?

USB Sharp ships an update every 3 weeks, and DUO every 3 months. Most recently, USB Sharp was updated on October 17, 2026 and DUO on October 17, 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.*