Comparison

DUO LINK 4 vs Harvest Right

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Free up iPhone/iPad space
  • Charge iOS devices
  • Back up contacts
  • Transfer photos and videos
  • Store photos directly
  • Manage files
  • Music and video playback
Features
Read full description

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 .

About

Harvest Right

Control and monitor your freeze dryer remotely. Set up new units, track batch progress, and receive alerts for any issues. Access tips, recipes, and customer support directly from your device.

Highlights
  • Remote freeze dryer monitoring
  • Batch progress tracking
  • Configurable app alerts
  • Personalize freeze drying experience
  • Access freeze drying tips and recipes
  • Direct customer support access
Features
Read full description

The Harvest Right App gives you direct access to your Harvest Right freeze dryer. Key features: Ability to easily set up a new freeze dryer so you can start using it without delay. Monitoring your freeze dryer's progress throughout the batch from anywhere through Wi-Fi *. Account sharing feature that allows others to monitor your freeze dryer.* Configurable app alerts that will instantly notify of batch progress so you can keep your freeze dryer running.* Ability to personalize your freeze drying experience including display name and screen color.* Instant access to Harvest Right’s freeze drying tips and tricks and the ability to personalize with your own recipes and settings. Ability to quickly start a batch based on the food being freeze dried. Receive instant alerts if your batch experiences any issue as well as direct feedback on how to keep your freeze dryer running.* Direct access to Harvest Right's customer support team, including the option to grant your support agent access to your freeze dryer for instant assistance.* * Requires Harvest Right WiFi Accessory

Screenshots

DUO LINK 44 screens
Harvest Right4 screens

Verdict

The call

The clearest difference is rating: Harvest Right at 4.7 against DUO LINK 4's 2.1. Harvest Right also leads on review sentiment (58% vs 20%) and update cadence (every 3 weeks vs every 2 months). DUO LINK 4's advantage is iOS requirement (11.0 vs 15.6). On price, ads, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Harvest Right holds the better App Store score, 4.7 against 2.1. That said, the two scores are not equally well evidenced: Harvest Right has 2.6K ratings behind it against 513, 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 58% of Harvest Right's.

UpkeepUpdate frequency

DUO LINK 4 ships an update every 2 months, Harvest Right every 3 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
DUO LINK 4 versus Harvest Right: the parameters behind the verdict, then further details
ParameterDUO LINK 4Harvest Right
PriceFreeFree
Rating2.1 (513 ratings)4.7 (2.6K ratings) — better
Positive reviews19.8% of reviews58.2% of reviews — better
Number of ratings5132.6K — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.6
Further details — not scored
Size123 MB36 MB
Age rating4+4+
DeveloperPNYHarvest Right LLC

Customer experience

DUO LINK 4

All ratings498 ratings
Positive23.9%
Neutral5.0%
Negative71.1%
Written reviews111 reviews
Positive19.8%
Neutral3.6%
Negative76.6%

Harvest Right

All ratings2,593 ratings
Positive94.3%
Neutral1.5%
Negative4.2%
Written reviews110 reviews
Positive58.2%
Neutral4.5%
Negative37.3%

User reviews

DUO LINK 4

From 513 App Store ratings

What we love

  • 🚀 Efficient file transfer
  • 💡 Useful for freeing up phone storage
  • 👍 Straightforward to use

Room to improve

  • 🐛 Frequent app crashes
  • 🔍 Confusing or limited UI
  • 🔌 Compatibility issues with newer devices
  • 💾 Data loss or corruption

Harvest Right

From 2.6K App Store ratings

What we love

  • 🚀 Freeze drying with WiFi dongle
  • 💡 Stores batch information
  • 👍 Great resource with frequent updates
  • 👍 Convenient app with many features

Room to improve

  • 🐛 WiFi dongle connection issues
  • 🐛 Keyboard glitches
  • 🔒 Difficult to create/login to account

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

Harvest Right

Reported bugs

3 issues
  • Unable to register devices
  • Inability to connect to WiFi
  • Verification emails not received

Requested features

3 requests
  • Add more food/candy options
  • Add personal notes section
  • Ability to control freeze dryer from app

In-app purchases

None

DUO LINK 4

No in-app purchases

None

Harvest Right

No in-app purchases

Questions

Is DUO LINK 4 free?
DUO LINK 4 is free to download, with no in-app purchases.
Is Harvest Right free?
Harvest Right is free to download, with no in-app purchases.
Which has better reviews, DUO LINK 4 or Harvest Right?
Harvest Right is rated higher. DUO LINK 4 averages 2.1 out of 5 from 513 ratings, while Harvest Right averages 4.7 from 2.6K ratings.
Do DUO LINK 4 or Harvest Right have ads?
Neither DUO LINK 4 nor Harvest Right shows ads.
Which is updated more often, DUO LINK 4 or Harvest Right?
DUO LINK 4 ships an update every 2 months, and Harvest Right every 3 weeks. Most recently, DUO LINK 4 was updated on November 2, 2026 and Harvest Right on November 3, 2026.

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