DUO vs i
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DUO
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.
- Expand iPhone/iPad storage
- USB and Lightning connectors
- Contact backup and restore
- Independent music/video playback
- Stream 1080p videos
- File management
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DUO-LINK/DUO-LINK R is a multi-functional storage device for Mac, PC, iPad, iPhone, and iPod touch. Duo-Link 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 Functions： ● Contact list backup and restore. ● Supports independent music and video playback. ● Stream 1080p videos directly from Duo-Link ● File management operations such as copy, delete, export etc. ● Browse files store on DUO-LINK Drive. ● Browse local files stored within Duo-Link App. ● Transfer media and files from iPhone to Duo-Link Drive. Compatibility： ● iPad, iPhone, iPod Touch with lightning connector running iOS version 8.0 or later. ● PCs running Windows XP, Windows 7, and Windows 8. ● Mac computers running Mac OS 10.5 or later.
i
Access and manage files on USB drives directly from your Apple device. Stream music, watch videos, and view photos stored on your USB flash drive. It also facilitates photo synchronization.
- Open USB Flash Drive files
- Stream music
- Watch videos
- View photos
- Sync photos
- USB 3.0 card reader compatible
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can open the" USB Flash Drive" Apple USB disk files, such as: music, video, photos, can beUSB3.0_ cardreade Apple USB disk and apple devices, sync photos. Photograph
Screenshots
Verdict
The clearest difference is update cadence: DUO at every 5 weeks against i's every 3 months. DUO also leads on iOS requirement (8.0 vs 11.0). On price, rating, ratings volume 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. Neither carries in-app purchases, so what you see is what you pay.
i holds the better App Store score, 2.1 against 2.0. Both are backed by a comparable volume of ratings — 51 and 83 respectively.
DUO ships an update every 5 weeks, i every 3 months. The most recent releases landed on October 22, 2026 and October 21, 2026 respectively.
| Parameter | DUO | i |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (51 ratings) | 2.1 (83 ratings) — better |
| Positive reviews | 13.2% of reviews | — |
| Number of ratings | 51 | 83 — better |
| Update frequency | Every 5 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 31 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Gopod Group Limited | 裕雨 程 |
Customer experience
DUO
i
Bugs and requests
DUO
Not enough reviews yet to summarise bugs or requests.
i
Reported bugs
4 issues- App crashes when trying to export files
- External storage not detected by app
- Corrupted or lost data after file transfers
- Compatibility issues with iPhone X and newer models
Requested features
4 requests- Add support for landscape mode
- Improve video playback capabilities
- Allow for better file management and organization
- Provide option to change app language
In-app purchases
DUO
No in-app purchases
i
No in-app purchases
