Comparison

DUO LINK 4 vs Energizer Connect

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

Energizer Connect

Control your smart home devices with ease from your smartphone. Manage multiple homes, rooms, and devices with intuitive controls, custom alerts, and automated schedules. Share access with family members for seamless home management.

Highlights
  • Plug-and-play device control
  • Multi-home and room profiles
  • Customizable alerts
  • Automated schedules and scenes
  • Device sharing with family
  • In-app live chat support
Features
Read full description

The Energizer Connect family of home automation products offers plug-and-play, easy to use devices--all controllable from your smartphone. The power of Energizer keeps you connected and in control! The easiest device pairing you've ever experienced lets you add multiple devices in seconds Elegant navigation lets you create profiles for multiple homes Add rooms within your homes to customize your experience View all of your devices per-room or per-home and control them all Intuitive device control screens let you control and set preferences on each device Alerts keep you informed of activity around your home Full history and activity data logging lets you look back in time Set alarms and schedules for convenience and security Scenes and triggers let you define rules to truly automate your home Share your device with other family members, let them control their own rooms or the whole home In-app live chat support experience, quick help for when you need it the most Experience our complete product lineup including: Doorbell Cameras Indoor and Outdoor Cameras Smart Lighting Power Products Smart Sensors and much more coming soon!

Screenshots

DUO LINK 44 screens
Energizer Connect4 screens

Verdict

The call

The clearest difference is rating: Energizer Connect at 4.7 against DUO LINK 4's 2.1. Energizer Connect also leads on review sentiment (36% vs 20%) and ratings volume (9.6K vs 513). DUO LINK 4's advantage is iOS requirement (11.0 vs 14.0). On price, update cadence, ads and in-app purchases 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

Energizer Connect holds the better App Store score, 4.7 against 2.1. That said, the two scores are not equally well evidenced: Energizer Connect has 9.6K 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 36% of Energizer Connect's.

UpkeepUpdate frequency

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

Scorecard4 real differences · 6 level
DUO LINK 4 versus Energizer Connect: the parameters behind the verdict, then further details
ParameterDUO LINK 4Energizer Connect
PriceFreeFree
Rating2.1 (513 ratings)4.7 (9.6K ratings) — better
Positive reviews19.8% of reviews35.8% of reviews — better
Number of ratings5139.6K — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.0 — better14.0
Further details — not scored
Size123 MB283 MB
Age rating4+12+
DeveloperPNYEnergizer Connect

Customer experience

DUO LINK 4

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

Energizer Connect

All ratings9,602 ratings
Positive93.4%
Neutral3.9%
Negative2.8%
Written reviews187 reviews
Positive35.8%
Neutral11.8%
Negative52.4%

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

Energizer Connect

From 9.6K App Store ratings

What we love

  • 👍 Affordable price
  • 🚀 Convenient and easy to use
  • 🔒 Reliable and secure
  • ✨ Affordable and worth the money

Room to improve

  • 🐛 Unstable app with bugs and glitches
  • 🤖 Poor customer support and unresponsive developers
  • 📶 Connectivity issues and unreliable connections
  • 🤯 Complicated setup and configuration process
  • 🔍 Limited features and functionality

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

Energizer Connect

Reported bugs

4 issues
  • Camera image distortion and half-screen issues
  • Frequent app crashes and freezes
  • Devices randomly going offline and unable to reconnect
  • Compatibility issues with newer iOS and Android versions

Requested features

5 requests
  • Add remote reset option for cameras
  • Improve video playback and review capabilities
  • Integrate with popular smart home platforms
  • Provide clearer instructions and documentation
  • Enhance app UI and user experience

In-app purchases

None

DUO LINK 4

No in-app purchases

None

Energizer Connect

No in-app purchases

Questions

Is DUO LINK 4 free?
DUO LINK 4 is free to download, with no in-app purchases.
Is Energizer Connect free?
Energizer Connect is free to download, with no in-app purchases.
Which has better reviews, DUO LINK 4 or Energizer Connect?
Energizer Connect is rated higher. DUO LINK 4 averages 2.1 out of 5 from 513 ratings, while Energizer Connect averages 4.7 from 9.6K ratings.
Do DUO LINK 4 or Energizer Connect have ads?
Neither DUO LINK 4 nor Energizer Connect shows ads.
Which is updated more often, DUO LINK 4 or Energizer Connect?
DUO LINK 4 ships an update every 2 months, and Energizer Connect every 3 months. Most recently, DUO LINK 4 was updated on November 2, 2026 and Energizer Connect on November 4, 2026.

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