SwiftKey's keyboard relies on the very trendy machine learning technology, where it learns from you as you type to better suggest the next word or phrase.
It's on over 300 million smartphones today, per the Financial Times report. Samsung and BlackBerry have both pre-installed the SwiftKey keyboard on some Android phones, and it once topped download charts on the Apple App Store and Google Play store.
For Microsoft, keyboards are a big deal right now, as it works to bring its own home-built Word Flow smart keyboard from the Windows 10 Mobile platform and over to the iPhone at some point in the near future. Word Flow for iPhone will reportedly feature a one-handed typing mode, too.
Microsoft also is a big fan of that same machine learning technology, using it to make tools like the Cortana virtual personal assistant better, faster, and more personal.
For SwiftKey, this is a solid exit: Despite its popularity, the London-based SwiftKey had trouble finding a solid and reliable business model, going from a $4 download to a free-to-use model where you had to pay for certain extras, but never settled into a groove, per that report.