# DUO vs i

The clearest difference is rating: DUO at 2.5 against i's 2.3. i's advantage is ratings volume (789 vs 86). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DUO holds the better App Store score, 2.5 against 2.3. That said, the two scores are not equally well evidenced: i has 789 ratings behind it against 86, so its average is the more settled of the two. Written reviews point the same way: 18% of DUO's written reviews are positive against 15% of i's.

Both ship on a similar rhythm, roughly every 3 months. Both last shipped on October 17, 2026.

## The numbers

| Metric | DUO | i |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (86 ratings)](https://appshunter.io/ios/app/duo-link-30/id1088185359/reviews)** | [2.3 (789 ratings)](https://appshunter.io/ios/app/i-flashdevice/id1100496131/reviews) |
| Number of ratings | 86 | **789** |
| Positive reviews | **17.5% of reviews** | 15.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 34 MB | 89 MB |
| Requires iOS | 8.0 | 8.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gopod Group Limited](https://appshunter.io/developer/975108489) | [ShenZhen 0101 technology Co.,Ltd](https://appshunter.io/developer/994444596) |

## What reviewers say

### 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


### i

[App page](https://appshunter.io/ios/app/i-flashdevice/id1100496131)

Easily manage all your files on iOS devices. Transfer documents, photos, music, and videos between different devices and platforms. Offers backup for contacts and camera roll, and supports a wide range of file formats.

**Highlights:** File management for iOS, Cross-platform file exchange, Backup contacts and camera roll, Play videos and music, Preview images, Supports wide file formats

**In-app purchases:** none

**What reviewers like**

- ⭐ Cool app
- 🚀 Able to transfer files directly
- 📸 Can take photos/videos within the app
- 🗄️ Useful for backing up files

**What reviewers complain about**

- 🐛 Crashes frequently
- ⚠️ Doesn't work with newer devices/iOS versions
- 🤖 Poor software quality and buggy
- 🔌 Drains device battery quickly
- 📂 Issues with file management and deletion

**Reported bugs**

- App crashes on launch
- Unable to connect to device
- Corrupted files after transfer
- Inconsistent behavior when viewing media

**Requested features**

- Add support for more file types
- Improve video playback functionality
- Provide better instructions and troubleshooting
- Optimize app for latest iOS versions


## Frequently asked questions

### Is DUO free?

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

### Is i free?

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

### Which has better reviews, DUO or i?

DUO is rated higher. DUO averages 2.5 out of 5 from 86 ratings, while i averages 2.3 from 789 ratings.

### Do DUO or i have ads?

Neither DUO nor i shows ads.

### Which is updated more often, DUO or i?

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