There’s a smart keyboard that’s been available for the last few generations of jailbreak called PredictiveKeyboard. Today, that tweak has been updated to support iOS 7 and, mostly, to support 64-bit ARM devices such as the iPhone 5s and iPad Air.
As you can most likely tell by the image above (not to mention the name of the tweak itself), the tweak starts predicting the words you’re typing to allow quicker and more efficient entry of longer words. PredictiveKeyboard will also provide error corrections for mistyped words that are–along with the predicted words–just one tap away in a fifth row above the standard keyboard.
PredictiveKeyboard is available right now in the BigBoss repo for just $2.39. If you’re not confident that the tweak will be something you’ll use, you can give it a try for 3 days absolutely free.