Comparison

Zmodo vs DUO LINK 4

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

Head to head
About

Zmodo

Control a variety of smart home products and connect with loved ones. Offers cloud services for enhanced connectivity and security. Manage your smart home devices remotely.

Highlights
  • Control smart home products
  • Seamless cloud service integration
  • Remote connectivity
  • Cloud service subscription options
  • Device management
Features
Read full description

Zmodo is the future of smart home solutions. The Zmodo app is designed to control a variety of smart home products and work seamlessly with Zmodo's cloud services to keep you connected with the ones you care about. Cloud Service Subscription Service Description 1. We offer two types of Cloud Service : Premium Cloud $4.99/month ($49.99/year) Platinum Cloud $9.99/month ($99.99/ year) *Prices displayed are for one device, the package price depends on the quantity of devices. 2. Subscribing to Cloud Service will be paid directly through the iTunes account. 3. 24 hours before the subscription service expires, the system will automatically renew and deduct the corresponding fees according to the plan type. 4. If you need to unsubscribe, please do so at least 24 hours before renewal date in the "Account Settings". 5. Privacy Policy and Terms of Use: Privacy Policy: http://www.zmodo.com/privacy-policy/ Terms of Use: http://www.zmodo.com/terms-of-services/

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 .

Screenshots

Zmodo4 screens
DUO LINK 44 screens

Verdict

The call

The clearest difference is in-app purchases: DUO LINK 4 at none against Zmodo's 10. DUO LINK 4 also leads on review sentiment (20% vs 7%) and iOS requirement (11.0 vs 15.1). Zmodo's advantage is update cadence (every 4 days vs every 2 months) and chart position (#59 vs unranked). On price, rating, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Zmodo sells 10 in-app purchases, starting at $4.99 per month. DUO LINK 4 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 2.0 for Zmodo against 2.1 for DUO LINK 4. That said, the two scores are not equally well evidenced: Zmodo has 3.9K ratings behind it against 513, so its average is the more settled of the two. Written reviews are what separate them: 7% of Zmodo's written reviews are positive against 20% of DUO LINK 4's.

UpkeepUpdate frequency

Zmodo ships an update every 4 days, DUO LINK 4 every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 4 level
Zmodo versus DUO LINK 4: the parameters behind the verdict, then further details
ParameterZmodoDUO LINK 4
PriceFreeFree
Rating2.0 (3.9K ratings)2.1 (513 ratings) — better
Positive reviews7.4% of reviews19.8% of reviews — better
Number of ratings3.9K — better513
Update frequencyEvery 4 days — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#59 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.111.0 — better
Further details — not scored
Size30 MB123 MB
Age rating4+4+
DeveloperEP Technology CorporationPNY

Customer experience

Zmodo

All ratings3,884 ratings
Positive22.8%
Neutral3.9%
Negative73.3%
Written reviews1,028 reviews
Positive7.4%
Neutral2.9%
Negative89.7%

DUO LINK 4

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

User reviews

Zmodo

From 3.9K App Store ratings

What we love

  • 🚀 Easy to set up
  • 🔒 Decent security features
  • 👍 Good value for money
  • 👍 Reliable connection

Room to improve

  • 🐛 Frequent app crashes
  • 🐛 Unreliable motion detection
  • 🐛 Laggy and slow performance
  • 🐛 Subscription required for full functionality
  • 🐛 Poor customer support

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

Bugs and requests

Zmodo

Reported bugs

4 issues
  • App login issues after updates
  • Inability to view recorded footage
  • Cameras going offline randomly
  • Time stamp issues on recorded videos

Requested features

5 requests
  • Landscape mode support
  • Customizable notification sounds
  • Faster video playback controls
  • Improved video quality and consistency
  • Remote camera reboot option

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

In-app purchases

10 purchases

Zmodo

Subscriptions10
  • Premium Cloud for 1 Device$4.991 Month
  • Platinum Cloud for 1 Device$9.991 Month
  • Premium Cloud for 2 Device$9.991 Month
Show 7 more
  • Premium Cloud for 3 Device$14.991 Month
  • Platinum Cloud for 2 Device$19.991 Month
  • Premium Cloud for 4 Device$19.991 Month
  • Premium Cloud for 5 Device$24.991 Month
  • Premium Cloud for 6 Device$29.991 Month
  • Premium Cloud for 1 Device$49.991 Year
  • Premium Cloud for 2 Device$99.991 Year
None

DUO LINK 4

No in-app purchases

Questions

Is Zmodo free?
Zmodo is free to download, with in-app purchases available.
Is DUO LINK 4 free?
DUO LINK 4 is free to download, with no in-app purchases.
Which has better reviews, Zmodo or DUO LINK 4?
DUO LINK 4 is rated higher. Zmodo averages 2.0 out of 5 from 3.9K ratings, while DUO LINK 4 averages 2.1 from 513 ratings.
Do Zmodo or DUO LINK 4 have ads?
Neither Zmodo nor DUO LINK 4 shows ads.
Which is updated more often, Zmodo or DUO LINK 4?
Zmodo ships an update every 4 days, and DUO LINK 4 every 2 months. Most recently, Zmodo was updated on October 27, 2026 and DUO LINK 4 on October 24, 2026.

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