DUO LINK 4 vs DoKnotForget
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DUO LINK 4
Manage and transfer files between your iOS device and a USB flash drive. Free up storage, back up data, and even charge your device. Supports a wide range of file formats for seamless integration.
- Free up iPhone/iPad space
- Charge iOS devices
- Back up contacts
- Transfer photos and videos
- Store photos directly
- Manage files
- Music and video playback
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PNY DUO LINK 4 app, designed to work with DUO LINK OTG USB 3.0 Flash Drive brings you the ability to do more when it comes to file transfer, saving, sharing, accessing and streaming. Simply connect the DUO LINK OTG USB 3.0 Flash Drive to your iPhone and iPad and start syncing, transferring, sharing files, photos, videos and more with ease. DUO LINK OTG USB 3.0 is a flash drive designed for iPhone and iPad that enables you to free up space on your iOS device, save and protrect your contents into DUO LINK and even transfer then to your computer. DUO LINK OTG USB 3.0 also provides the ability for you to charge your iPhone and iPad. Features and Benefits: - Free up space on your iPhone or iPad. - Charge your iOS device. - Back-up your contacts. - Transfer and share your videos, photos and more. - Store photos directly into DUO LINK and save space on your iPhone or iPad. - Manage files on your iPhone, iPad and on DUO LINK. - Supports independent music and video playback. - Automatically back up your photos and videos so that you don't have to. Support: Please visit PNY Support at www.pny.com/support/technical-support Supported file formats: - video: M4V/MP4/MOV - Audio: M4A, CAF, AIFF, ASF, AAC, mp3, wav - Picture: TIFF, JPEG,JPG,PNG,GIF,BMP - Document: DOC, DOCX, PAGES, RTF, TXT , PPT, PPTX, PDF, XLS, XLSX, NUMBERS, KEY, HTML PNY takes no responsibility or liability with respect to the download or usage of DUO-LINK 4 app. By downloading this app you agree to the end user license agreement from PNY, also available at http://www.pny.com/File%20Library/Unassigned/PNY--On-the-Go-End-User-License-Agreement.pdf .
DoKnotForget
Never miss an important date again. This app helps you remember birthdays, holidays, and other meaningful moments for the people you care about. It offers simple, thoughtful reminders to ensure you show up when it counts.
- Personalized reminders
- Birthday tracking
- Holiday notifications
- Meaningful moment alerts
- Simple setup
- Clutter-free interface
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DoKnotForget helps you remember the moments that matter — so the people you love feel remembered. Add the people who matter most, and we’ll remind you about birthdays, holidays, and meaningful moments right on time. No clutter. No complicated setup. Just simple, thoughtful reminders that help you show up when it counts. Because remembering isn’t just about dates — it’s about people.
Screenshots
Verdict
The clearest difference is review sentiment: DoKnotForget at 100% against DUO LINK 4's 20%. DoKnotForget also leads on rating (5.0 vs 2.1). DUO LINK 4's advantage is in-app purchases (none vs 1) and ratings volume (498 vs 1). On price, update cadence, ads and device support 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. DoKnotForget sells 1 one-off in-app purchase. DUO LINK 4 asks for nothing beyond the download.
DoKnotForget holds the better App Store score, 5.0 against 2.1. That said, the two scores are not equally well evidenced: DUO LINK 4 has 498 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 20% of DUO LINK 4's written reviews are positive against 100% of DoKnotForget's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.
| Parameter | DUO LINK 4 | DoKnotForget |
|---|---|---|
| Price | Free | Free |
| Rating | 2.1 (498 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 19.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 498 — better | 1 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 123 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | PNY | Jessica Downes |
Customer experience
DUO LINK 4
DoKnotForget
Bugs and requests
DUO LINK 4
Reported bugs
3 issues- App fails to detect connected device
- Transferred files not visible or accessible
- Inconsistent behavior when renaming folders
Requested features
4 requests- Add 'select all' option for photos/files
- Support for more file formats
- Improve iPad app experience
- Integrate with native Files app
DoKnotForget
Not enough reviews yet to summarise bugs or requests.
In-app purchases
DUO LINK 4
No in-app purchases
DoKnotForget
- Premium$1.99
Questions
Is DUO LINK 4 free?
Is DoKnotForget free?
Which has better reviews, DUO LINK 4 or DoKnotForget?
Do DUO LINK 4 or DoKnotForget have ads?
Which is updated more often, DUO LINK 4 or DoKnotForget?
Other comparisons
