Comparison

Duet Display vs Twomon SE

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

Head to head
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
Read full description

#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

About

Twomon SE

Transform your tablet into a portable USB monitor for your computer. Expand your workspace for lectures, video editing, or any task requiring more screen real estate. Simply connect your device and instantly gain an additional display.

Highlights
  • Turns tablet into USB monitor
  • Portable dual monitor solution
  • Expands computer workspace
  • Easy USB connection
  • Supports Windows and iOS
Read full description

Twomon SE is very simple. Your iPad becomes a USB monitor at the moment you connect. Do you want to take a lecture smarter in the lecture room? Meet your iPad as a dual monitor. With Twomon SE, you do not need to hide and load several programs on your monitor. Is there a monitor shortage while editing a video? Meet your iPad with a dual monitor. If you have the Twomon SE, you can use additional monitor in a small space. You can download the PC program from the website for free. Website: https://www.easynlight.com/en/twomonse Twomon SE supports PC and device below. - Windows 10 version 1703 or later / WDDM version 2.0 or later - iOS 11 or later Twomon SE always has a friendly tech support team. Please feel free to contact us through our website if you have any questions. :) Support : https://www.easynlight.com/en/supporttwomon

Screenshots

Duet Display3 screens

Verdict

The call

The clearest difference is price: Duet Display at Free against Twomon SE's $9.99. Duet Display also leads on rating (4.4 vs 4.0) and update cadence (every 3 weeks vs every 6 months). Twomon SE's advantage is review sentiment (85% vs 45%) and in-app purchases (none vs 6).

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

Duet Display is free to download; Twomon SE costs $9.99 up front. Duet Display sells 6 in-app purchases, starting at $3.99 per month. Twomon SE asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Duet Display holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Duet Display has 49K ratings behind it against 57, so its average is the more settled of the two. Written reviews complicate that: 45% of Duet Display's written reviews are positive against 85% of Twomon SE's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Duet Display ships an update every 3 weeks, Twomon SE every 6 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

Scorecard10 real differences · 0 level
Duet Display versus Twomon SE: the parameters behind the verdict, then further details
ParameterDuet DisplayTwomon SE
PriceFree — better$9.99
Rating4.4 (49K ratings) — better4.0 (57 ratings)
Positive reviews45.5% of reviews84.6% of reviews — better
Number of ratings49K — better57
Update frequencyEvery 3 weeks — betterEvery 6 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Vision Pro — betteriPad
Requires iOS13.011.0 — better
Further details — not scored
Size59 MB50 MB
Age rating4+4+
DeveloperDuet, Inc.DEVGURU Co., Ltd.

Customer experience

Duet Display

All ratings48,776 ratings
Positive86.2%
Neutral3.1%
Negative10.7%
Written reviews2,386 reviews
Positive45.5%
Neutral6.7%
Negative47.9%

Twomon SE

All ratings55 ratings
Positive74.5%
Neutral0.0%
Negative25.5%
Written reviews91 reviews
Positive84.6%
Neutral2.2%
Negative13.2%

Bugs and 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

Twomon SE

Not enough reviews yet to summarise bugs or requests.

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
None

Twomon SE

No in-app purchases

Questions

Is Duet Display free?
Duet Display is free to download, with in-app purchases available.
Is Twomon SE free?
Twomon SE costs $9.99, with no in-app purchases.
Which has better reviews, Duet Display or Twomon SE?
Duet Display is rated higher. Duet Display averages 4.4 out of 5 from 49K ratings, while Twomon SE averages 4.0 from 57 ratings.
Do Duet Display or Twomon SE have ads?
Duet Display shows ads; Twomon SE does not.
Which is updated more often, Duet Display or Twomon SE?
Duet Display ships an update every 3 weeks, and Twomon SE every 6 months. Most recently, Duet Display was updated on October 27, 2026 and Twomon SE on October 24, 2026.

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