By Nathan Olivarez-Giles 

Microsoft Corp. has built a fantastic one-handed smartphone keyboard, but you'll need an iPhone -- and not a Windows phone -- to use it.

On Monday, Microsoft's free Word Flow keyboard app made its U.S. debut in Apple Inc.'s iOS App Store. As the rather small number of Windows smartphone users out there may know, Word Flow is the name of the keyboard in the Windows Phone 8/Windows 10 Mobile operating systems. But while the name is the same, multiple just-for-iPhone features set the two keyboards apart.

The best part is the one-handed keyboard option. Designed for people who have a hard time reaching their thumb across an iPhone display, the keyboard curves into an arc to bring every key into reach. (The arc can lock to either side of the phone, for righties and lefties.) It is helpful on an iPhone 6s -- doubly so on the larger 6s Plus, which forces many people to type with two hands.

Once you've installed the app, you launch the keyboard by tapping the globe icon on the iPhone keyboard (the same button to get emojis). I have fairly large hands, but even I preferred typing on the curved keyboard when I had to use one hand, like banging out a quick email while carrying my lunch back to the office.

The iPhone version of Word Flow also lets you change the keyboard background to your own photo. Windows phone users can't do this either -- though I'm not really sure why anybody would care to.

When asked whether Microsoft will eventually offer the new keyboard features on Android or Windows phones, a Microsoft spokesperson said the company "has nothing more to share at this time."

Both iPhone and Windows phone versions have predictive text and gesture typing, which lets you continuously slide your finger across keys to spell out words. Many other keyboards, like Swype and the Microsoft-owned SwiftKey, also do this.

There are other one-handed keyboards for the iPhone, including Blink and Minuum. But these shrink keys rather than curve them, making them tougher to tap.

Write to Nathan Olivarez-Giles at Nathan.Olivarez-giles@wsj.com

 

(END) Dow Jones Newswires

April 25, 2016 18:25 ET (22:25 GMT)

Copyright (c) 2016 Dow Jones & Company, Inc.
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