Comparison

DUO LINK 4 vs KrokiRoki

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

KrokiRoki

Features
Read full description

Transform your daily routine with our habit-building app designed for both solo and group motivation. Easily create personalized habits, share them with friends, and track everyone's progress in real-time. Whether you want to improve productivity, health, or any other goal, our app helps you stay accountable and motivated by combining personal discipline with social support. Join a community of habit builders and make progress together! Features include habit creation, progress tracking and cooperative challenges to keep you and your friends motivated every day. Start building better habits today in cooperation with your friends! Terms of Use : https://www.apple.com/legal/internet-services/itunes/dev/stdeula

Screenshots

DUO LINK 44 screens
KrokiRoki3 screens

Verdict

The call

The clearest difference is in-app purchases: DUO LINK 4 at none against KrokiRoki's 2. DUO LINK 4 also leads on iOS requirement (11.0 vs 14.0.0). KrokiRoki's advantage is update cadence (every 4 days vs every 2 months). On price, 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. KrokiRoki sells 2 in-app purchases, starting at $1.99 per month. DUO LINK 4 asks for nothing beyond the download.

UpkeepUpdate frequency

DUO LINK 4 ships an update every 2 months, KrokiRoki every 4 days. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 7 level
DUO LINK 4 versus KrokiRoki: the parameters behind the verdict, then further details
ParameterDUO LINK 4KrokiRoki
PriceFreeFree
Rating2.1 (498 ratings) — better—
Positive reviews19.8% of reviews—
Number of ratings498 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better14.0.0
Further details — not scored
Size123 MB47 MB
Age rating4+17+
DeveloperPNYAliaksandr Prymachenka

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

KrokiRoki

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

DUO LINK 4

No in-app purchases

2 purchases

KrokiRoki

Subscriptions1
  • KrokiRoki Premium Access$1.991 Month
One-time1
  • KrokiRoki Premium Access$3.99

Questions

Is DUO LINK 4 free?
DUO LINK 4 is free to download, with no in-app purchases.
Is KrokiRoki free?
KrokiRoki is free to download, with in-app purchases available.
Do DUO LINK 4 or KrokiRoki have ads?
Neither DUO LINK 4 nor KrokiRoki shows ads.
Which is updated more often, DUO LINK 4 or KrokiRoki?
DUO LINK 4 ships an update every 2 months, and KrokiRoki every 4 days. Most recently, DUO LINK 4 was updated on October 13, 2026 and KrokiRoki on October 2, 2026.

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