# DUO LINK 4

> Lifestyle

Canonical page: [https://chrome-stats.com/d/id1103672387](https://chrome-stats.com/d/id1103672387)

## Overview

- **ID:** `id1103672387`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** PNY
- **Category:** Lifestyle
- **Rating:** 2.10 / 5 (513 ratings)
- **Version:** 1.0.86
- **Last updated:** 2023-12-14
- **First published:** 2016-05-31
- **Size:** 123 MB
- **Data as of:** 2026-09-25
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/duo-link-4/id1103672387)
- **Privacy policy:** [https://www.pny.com/legal/privacy](https://www.pny.com/legal/privacy)

## Description

DUO LINK 4 is a companion app designed to work with the DUO LINK OTG USB 3.0 Flash Drive, bringing easy file transfer, sharing, backup, and streaming to iPhone and iPad. It frees up space on iOS devices, stores photos directly on the drive, and can even charge your device while connected. You can manage files across iPhone, iPad, and DUO LINK and enjoy independent music and video playback.

Key features include automatic photo and video backups, contact backups, and seamless transfer of videos, photos, and more. The app supports common formats such as M4V/MP4/MOV video, M4A, MP3, WAV audio, JPEG/PNG/GIF images, and many documents (DOC, DOCX, PDF, PPT, XLS, HTML). PNY provides support; by downloading you agree to the End User License Agreement.

## Rankings

- #98,798 — Overall

## Review summary

Users report widespread instability and compatibility problems with Duo Link 4. The app frequently crashes, struggles with USB-C devices, and can corrupt or lose transferred media. Compatibility with newer iPhones/iPads and Files app integration are common pain points; support and updates appear limited. Some positives include a working Lightning path for some devices and the app's organization features, plus the ability to offload storage to the external drive. Overall, reliability is questionable despite its intended usefulness.

### Pros

- Lightning-compatible operation on devices using Lightning (works for some users).
- App helps organize files/media when it functions.
- Potential to free up phone storage by moving photos/videos to the external Duo Link drive (reported by some users).

### Cons

- Frequent crashes and instability, including crashes on startup and during use.
- Significant USB-C/newer-device compatibility issues; devices not detected or not supported.
- Data integrity problems: photos/videos corrupted or missing after transfer.
- Poor support and lack of ongoing updates; clunky UI and difficult workflow.
- Limited iOS Files integration and need for internet/extra steps to transfer (not seamless).

## Similar extensions and apps

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- [iDUO Drive](https://chrome-stats.com/d/id1144071891) — 2.40 / 5
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- [DuoBridge](https://chrome-stats.com/d/id6755104381)
- [U-Disk](https://chrome-stats.com/d/id1119397038) — 2.40 / 5
- [SanDisk iXpand™ Sync](https://chrome-stats.com/d/id923254823) — 4.60 / 5
- [iDUO GALAX](https://chrome-stats.com/d/id1169937649) — 2.00 / 5
- [PowerDrive 2.0](https://chrome-stats.com/d/id1261226028) — 2.50 / 5
- [Share FileLink](https://chrome-stats.com/d/id6751405385) — 3.00 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1103672387)