# USB Sharp vs DUO

The clearest difference is rating: USB Sharp at 3.1 against DUO's 1.9. USB Sharp also leads on review sentiment (53% vs 13%). DUO's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price, ratings volume, update cadence 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 1.9. Both are backed by a comparable volume of ratings — 18 and 52 respectively. Written reviews point the same way: 53% of USB Sharp's written reviews are positive against 13% of DUO's.

USB Sharp ships an update every 3 weeks, DUO every 5 weeks. The most recent releases landed on September 21, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | USB Sharp | DUO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (18 ratings)](https://appshunter.io/ios/app/usb-sharp/id427762463/reviews)** | [1.9 (52 ratings)](https://appshunter.io/ios/app/duo-link/id982410478/reviews) |
| Number of ratings | 18 | **52** |
| Positive reviews | **53.2% of reviews** | 12.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 55 MB | 31 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/id982410478)

Expand storage for your Apple devices and computers. Easily transfer files, back up contacts, and play media directly from the device. Free up space on your iPhone and iPad with this versatile storage solution.

**Highlights:** Expand iPhone/iPad storage, USB and Lightning connectors, Contact backup and restore, Independent music/video playback, Stream 1080p videos, File management

**Features:** macOS Compatibility

**In-app purchases:** none


## 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 1.9 from 52 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 5 weeks. Most recently, USB Sharp was updated on September 21, 2026 and DUO on October 4, 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.*