This replacement for the stock Android keyboard brings a wealth of to the table. It normally sells for $3.99, but for the next few days, you can .

Just how good is it? The app earned an average of 4.5 stars (out of 5) from some 70,000 users on Google Play, and Business Insider claimed yesterday that it will

Overstatement? As a pretty dedicated iPhone user, I can attest that I wish SwiftKey 3 was available for iOS. There's no question I can type significantly faster on a SwiftKey-equipped Android phone than I can with my iPhone 4S.

The chief piece of magic conjured by the app is its ability to guess the words you're typing as you're typing them, which it does with uncanny accuracy.

And not just the current word, but also the one that comes after. For examply, suppose you want to type "pretty good." By the time you get to "pr," you'll see the word "pretty" appear in the predictive-text bar just above the keyboard. One tap and the full word gets inserted.