Comparison

QualityStudy vs Duet Display

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

Head to head
About

QualityStudy

Features
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数秒単位の作業の記録ができます。2つの作業を並行して行っている場合や割り込み業務の記録も簡単。 事前に作業名や場所をCSVファイルで登録しておけば数回のタップで開始終了時刻、作業名、場所を記録できます。 iTunesやFinderで記録データを取り出すことができます。

About

Duet Display

Transform your iPad or iPhone into an advanced, lag-free extra display for your Mac or PC. Interact with your computer using touch and gestures, and unlock professional drawing capabilities with Apple Pencil support.

Highlights
  • Extra display for Mac & PC
  • Lag-free performance
  • Touch and gesture support
  • Apple Pencil integration
  • Professional drawing tools
  • Portable productivity
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#1 best-selling iPad app in US, Japan, UK, Germany, and 17 other countries! Duet turns your iPad or iPhone into the most advanced extra display for your Mac & PC. Developed by a team of ex-Apple engineers, Duet offers unparalleled performance and display quality - all with zero lag. — DO MORE — Be twice as productive by multitasking with two screens. And for those that travel, have a portable way to stay productive. — INCREDIBLY SIMPLE — To get started, plug your iPad into your desktop using your charging cable. The free Duet desktop app will automatically detect your device, and transform it into a high performance touchscreen display. There’s no need to worry about unreliable Wi-Fi, laggy performance, pixelated screens or managing network passwords. — TOUCHSCREEN — Interact with Mac & PC like never before, with touch & gestures, including two-finger scrolling, pan and zoom. And with our latest release, you can even add a touch bar to any iPad with any Mac. — PERFECT FOR APPLE PENCIL — With Duet Pro, you can turn your iPad and Apple Pencil into a professional graphics tablet. We’ve re-engineered our rendering algorithms for ultra-responsive drawing, optimized specifically for designers, illustrators and artists. Duet Pro also unlocks pressure & tilt sensitivity, hover, palm rejection, and more to seamlessly draw in the most powerful programs for professionals. Get precise control in Photoshop, Corel Painter, Lightroom, ToonBoom, Illustrator, Manga Studio and more.  — PRESS — TechCrunch - "Feels Like Magic" TIME - "Getting Work Done Faster and More Efficiently" The Guardian - "Lag-free" Forbes - "The simple thing to note is this...Duet Display works." The Verge - "Glorious Fluidity" Lifehacker - "It's fast, easy to use, and works great" Business Insider - "Zero lag and true retina resolution” Wall Street Journal - “It’s as easy as just plugging it in" — REVIEWS — “Awesome! My iPad Pro can be an extra monitor! Cool app” ~CEO of T-Mobile, John Legere “Very smooth and responsive indeed, plus you could use the touch screen to “click” on screen interfaces!” ~Photographer, Lok Cheung “Love the ability to use my iPad as a monitor with Duet.” ~Former Chief Evangelist of Apple, Guy Kawasaki “Just started using this app called Duet… Kinda love it so far.” ~Comedian and Youtube, Phillip DeFranco “All my mac folks look at the Duet app… GREAT!” ~Actor and Comedian, Sinbad  "I really like the app, I suppose the biggest compliment I can give is that it's so easy to setup it almost seems like an Apple product.” ~Early Adopter, M. Nightingale "Amazing solution for me by the way. Works as I was hoping for and actually my main reason for getting an iPad : )” ~Early Adopter, M. Gemzoe Duet Works With: All iPhones and iPads with iOS 7.0 and later All Macs with 10.9 (Mavericks) and later All PCs with Windows 7 and later Duet Pro Works With: All iPad Pros with Apple Pencil All Macs with 10.9 (Mavericks) and later All PCs with Windows 8.1 and later (64 bit) Duet Pro is an optional upgrade for additional features, and price may vary by location. Duet Pro subscriptions will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. You will not be able to cancel the subscription once activated. Manage Duet Pro in Account Settings after the optional upgrade. Learn more at http://www.duetdisplay.com Terms: https://www.duetdisplay.com/help-center/duet-terms-and-conditions Privacy Policy: https://www.duetdisplay.com/help-center/duet-privacy-policy

Screenshots

QualityStudy4 screens
Duet Display3 screens

Verdict

The call

The clearest difference is in-app purchases: QualityStudy at none against Duet Display's 6. QualityStudy also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement 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. Duet Display sells 6 in-app purchases, starting at $3.99 per month. QualityStudy asks for nothing beyond the download.

UpkeepUpdate frequency

QualityStudy ships an update every 5 weeks, Duet Display every 3 weeks. The most recent releases landed on May 16, 2026 and September 25, 2026 respectively.

Scorecard2 real differences · 8 level
QualityStudy versus Duet Display: the parameters behind the verdict, then further details
ParameterQualityStudyDuet Display
PriceFreeFree
Rating—4.4 (49K ratings) — better
Positive reviews—45.5% of reviews
Number of ratings—49K — better
Update frequencyEvery 5 weeksEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Vision Pro — better
Requires iOS12.012.0
Further details — not scored
Size18 MB69 MB
Age rating4+4+
DeveloperUNICUS Co., Ltd.Duet, Inc.

Bugs and requests

QualityStudy

Not enough reviews yet to summarise bugs or requests.

Duet Display

Reported bugs

3 issues
  • Incompatibility with certain software and drivers
  • Laggy performance and input delays
  • Unreliable connection and frequent disconnects

Requested features

4 requests
  • Improved resolution and scaling options
  • Better support for older devices and Windows
  • More customization and control over settings
  • Wireless connectivity without subscription

In-app purchases

None

QualityStudy

No in-app purchases

6 purchases

Duet Display

Subscriptions6
  • Duet Starter (Monthly)$3.991 Month
  • Duet Air (Monthly)7 Days trial$5.991 Month
  • Duet Pro7 Days trial$7.991 Month
Show 3 more
  • Duet Starter (Annual)$39.991 Year
  • Duet Air (Annual)7 Days trial$49.991 Year
  • Duet Pro (Annual)7 Days trial$79.991 Year

Questions

Is QualityStudy free?
QualityStudy is free to download, with no in-app purchases.
Is Duet Display free?
Duet Display is free to download, with in-app purchases available.
Do QualityStudy or Duet Display have ads?
Duet Display shows ads; QualityStudy does not.
Which is updated more often, QualityStudy or Duet Display?
QualityStudy ships an update every 5 weeks, and Duet Display every 3 weeks. Most recently, QualityStudy was updated on May 16, 2026 and Duet Display on September 25, 2026.

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