Quick update, the post is 6 years old and we are on iOS 13.0 and the builtin apple keyboard on iOS comes with Swype now, so all of these keyboards reviewed below are rendered unnecessary unless you are going to use them for a different function besides just Swype functionality.
iOS has come a long way since the version 1.0, in fact it has been 8 years since the OS was first launched. To be truly judgemental, version 8 has seen the most exciting features ever since the launch of App store. Since this is a very detailed post on iOS 8 Keyboard Extensions and there are quite a lot of features that shipped with iOS 8, its better you check out the full list of features elsewhere here.
Extensions across iOS has been the most talked about feature of this release, and I have been looking forward to third party keyboard extensions ever since I saw the swipe keyboards on Android. iOS 8 brings keyboard extensions to all iOS 8 supported devices which are iPhone 4S and later models, iPod 5th Generation, iPad 2nd Genartation and later and iPad Mini all versions. Here is how some popular third party keyboards work and how they fare so far in real life. But before that some “iOS -Keyboards”