Swiftkey like keyboards (like … Swiftkey or the iOS one) are keyboards where you write your words by swiping your finger across the letters of the keyboard, releasing your finger between each word.
SwiftKey is for some reason significantly worse on ios than android. I still use it because it has far better correction than the builtin keyboard and I haven't found any other that supports multiple simultaneous languages on ios.
Like this : https://youtu.be/D2XyP7iUErI at 00:17