SwiftKey

The white-on-black keyboard is its default, but there are multiple custom themes in SwiftKey to suit your individual tastes. In our tests SwiftKey did err with a few words (such as ‘did’ instead of ‘dog’). Since the competition is fierce, that kind of thing stands out; naturally, the more you use these keyboards, the more accurate they become. The more defined buttons of the prediction bar above the keys made a difference, because they stand out more, and therefore get your attention more readily.