Comparison

Duet Air vs WhenWas

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

Head to head
About

Duet Air

Transform your iPad or iPhone into an advanced remote desktop or an extra display for your Mac or PC. Experience unparalleled performance and zero lag, with touch and gesture support. Offers professional-grade drawing capabilities with Apple Pencil integration for artists and designers.

Highlights
  • Remote desktop functionality
  • Extra display for Mac/PC
  • Touch and gesture support
  • Apple Pencil integration for drawing
  • Wireless and wired connectivity
  • Zero lag performance
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 Remote Desktop or 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 or choose the desktop to wirelessly connect to. The Duet desktop app will automatically detect your device, and transform it into a high performance touchscreen display. — 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 11.0 and later All Macs with 10.11 (Mavericks) and later All PCs with Windows 10 64-bit and later Duet Air is a $24.99 per year service built for professionals and remote workers. Price may vary by location. Duet Air 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 Air in Account Settings after the optional upgrade. Learn more at http://www.duetdisplay.com Terms: https://help.duetdisplay.com/duet-terms-services Privacy Policy: https://help.duetdisplay.com/duet-privacy-policy

About

WhenWas

Effortlessly track recurring activities and important life events. This app helps you remember the last time you performed tasks like haircuts, maintenance, or medication. Widgets and a clean interface make tracking simple and accessible.

Highlights
  • Home and lock screen widgets
  • Apple Watch app integration
  • Smart search functionality
  • Timeline history for activities
  • Clean, intuitive design with dark mode
  • Optional iCloud sync for cross-device access
Features
Read full description

Remember the last time. Know what comes next. WhenWas is a straightforward last-time tracker and maintenance log for the small but important things that don’t belong on a fixed calendar. Watering plants, replacing filters, servicing a bike, grooming a pet, calling family—check in with one tap and instantly see how long it has been. No streaks to protect. No guilt. Just a clear history and the context you need for the next check-in. TRACK TIME, USES, MILEAGE & HOURS Enhanced Activities let you track maintenance by: • Time since the last check-in • Number of uses or cycles • Mileage and meter readings • Operating hours • Walking, running, or cycling distance from Apple Health Set a maintenance goal, view progress at a glance, add a use, or update a meter directly from your activity list. When maintenance is complete, WhenWas saves the finished interval to your timeline. SAVE THE DETAILS YOU’LL NEED LATER Keep model numbers, supplies, sizes, instructions, and other permanent notes with each activity. Add optional notes to individual check-ins so your history tells the full story. SHARE WITH FAMILY & FRIENDS Invite people to a shared activity so everyone can see and update the latest check-in. It is ideal for household routines like feeding the dog, cleaning the litter box, changing sheets, or replacing a filter. USE WHENWAS FOR • Home maintenance, plants, filters, and cleaning • Pet care, treatments, grooming, and vet visits • Haircuts, dentist visits, contacts, and medication refills • Family calls, date nights, and catching up with friends • Oil changes, tire rotations, batteries, and bike service • Generator hours, tool usage, and equipment maintenance • Running shoes, bikes, and other fitness gear BUILT FOR APPLE DEVICES • Timeline history with optional notes • Siri and Shortcuts • Apple Watch app • Home Screen widgets • Custom reminders • Search, filters, and pinned activities • iCloud sync • Dark Mode and accessible controls PRIVATE BY DESIGN Your data stays on your devices and in your personal iCloud. WhenWas does not store your activity data on its own servers. FREE & PRO Use WhenWas free with up to five activities, timeline history, Siri, and Apple Watch. WhenWas Pro unlocks unlimited activities, Enhanced Activities, Apple Health tracking, sharing, custom reminders, pinned activities, widgets, notes, and iCloud sync. Download WhenWas and stop wondering, “When did I last…?”

Screenshots

Duet Air3 screens
WhenWas4 screens

Verdict

The call

The clearest difference is review sentiment: WhenWas at 100% against Duet Air's 24%. WhenWas also leads on rating (5.0 vs 4.3) and monetization model (freemium vs subscription). Duet Air's advantage is ratings volume (1.9K vs 4) and iOS requirement (12.0 vs 18.0). On price, update cadence, in-app purchases 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. Duet Air sells 2 in-app purchases, starting at $49.99 per year and WhenWas sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

WhenWas holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Duet Air has 1.9K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 24% of Duet Air's written reviews are positive against 100% of WhenWas's.

UpkeepUpdate frequency

Duet Air ships an update every 3 weeks, WhenWas every 2 weeks. The most recent releases landed on September 22, 2026 and September 8, 2026 respectively.

Scorecard6 real differences · 4 level
Duet Air versus WhenWas: the parameters behind the verdict, then further details
ParameterDuet AirWhenWas
PriceFreeFree
Rating4.3 (1.9K ratings)5.0 (4 ratings) — better
Positive reviews23.8% of reviews100.0% of reviews — better
Number of ratings1.9K — better4
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationSubscriptionFreemium — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS12.0 — better18.0
Further details — not scored
Size67 MB4 MB
Age rating4+4+
DeveloperDuet, Inc.Drew Cortright

Customer experience

Duet Air

All ratings1,870 ratings
Positive82.5%
Neutral4.0%
Negative13.5%
Written reviews421 reviews
Positive23.8%
Neutral6.2%
Negative70.1%

WhenWas

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Duet Air

Reported bugs

5 issues
  • Incompatible with Citrix
  • Breaks Windows network
  • Bricked user's PC
  • Login screen issues
  • Inconsistent performance

Requested features

5 requests
  • Support for older devices
  • Improve wireless stability
  • Add audio support
  • Better integration with drawing apps
  • Easier subscription cancellation

WhenWas

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Duet Air

Subscriptions2
  • Duet Air (Annual)7 Days trial$49.991 Year
  • Duet Pro (Annual)7 Days trial$79.991 Year
2 purchases

WhenWas

One-time2
  • Monthly Subscription$2.99
  • Yearly Subscription$29.99

Questions

Is Duet Air free?
Duet Air is free to download, with in-app purchases available.
Is WhenWas free?
WhenWas is free to download, with in-app purchases available.
Which has better reviews, Duet Air or WhenWas?
WhenWas is rated higher. Duet Air averages 4.3 out of 5 from 1.9K ratings, while WhenWas averages 5.0 from 4 ratings.
Do Duet Air or WhenWas have ads?
Duet Air shows ads; WhenWas does not.
Which is updated more often, Duet Air or WhenWas?
Duet Air ships an update every 3 weeks, and WhenWas every 2 weeks. Most recently, Duet Air was updated on September 22, 2026 and WhenWas on September 8, 2026.

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