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There’s no question that having a second monitor helps boost productivity, especially if you’re otherwise stuck on a long trip with a tiny laptop display. The good news is that you may already own an external monitor without even knowing it. iPad apps let you turn your tablet into a second display, but few function as well as a dedicated external monitor, with the exception of Duet Display.

Duet was designed by former Apple engineers, and it definitely shows. Many other apps connect to your laptop over WiFi, but Duet draws power and the video signal over USB. The result is a sharp picture with very little lag, though you might notice a slowdown with older computers. Your laptop battery will also take a big hit (it’s powering the iPad), so you’ll want to be plugged in whenever possible. You can save some juice by using your iPhone instead, though you’ll obviously have less screen real estate in that case.

Duet
Duet’s external-display app for iPad and iPhone now supports Windows 7 and Windows 8.

All that aside, whether you’re working from a cubicle or under an umbrella on your overwater villa, Duet can’t be beat. You could even use your iPad as an external monitor on a long-haul flight, though your neighbor might not be thrilled about your mobile workstation if you’re stuck back in coach (we’d recommend booking something like this instead). Another handy feature: You can use your iPad’s touchscreen like a mouse, though I’ve found that to be a bit of a struggle, especially in high-resolution mode (on Retina iPads), where anything I want to tap appears quite small.

As of today, Duet now supports Windows 7 and Windows 8, so you can use your iPad as an external monitor with any recent Windows computer. The Duet folks say that covers about 80% of Windows machines, and they expect to support Windows 10 on launch day. The other good news is that Duet is only $10 in the App Store if you buy today (I paid $15.99, which is still a steal).

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More Things to Know
  • Limited Time Offer: Earn up to 100,000 Membership Rewards® Points.
  • Earn 50,000 Membership Rewards® points after you spend $10,000 & an extra 50,000 points after you spend an additional $15,000 all on qualifying purchases within your first 3 months of Card Membership. Offer ends 8/8/18.†
  • Get 5X Membership Rewards® points on flights and prepaid hotels on amextravel.com.
  • Get 50% more Membership Rewards® points. That's 1.5 points per dollar, on each eligible purchase of $5,000 or more. You can get up to 1 million additional points per year.
  • 35% Airline Bonus: Use Membership Rewards® Pay with Points for all or part of a flight with your selected qualifying airline, and you can get 35% of the points back, up to 500,000 bonus points per calendar year.
  • You can also receive 35% points back on all First and Business class flights, with all airlines available through American Express Travel.
  • You can enjoy access to The American Express Global Lounge Collection℠ offering access to the most lounges across the globe, when compared with other U.S. credit card offerings. As of 11/2017
  • Terms Apply
  • See Rates & Fees
Intro APR on Purchases
N/A
Regular APR
N/A
Annual Fee
$450
Balance Transfer Fee
See Terms
Recommended Credit
Excellent Credit
Terms and restrictions apply. See rates & fees.

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