ThumbFan app is one finger keyboard application. All keys lay on "Fan" like circular layout, so all you need is one thumb.
This app has been released first than any other 'Fan Like Keyboards' on iOS.
Especially it works well with large screen device like iPhone 7 plus, iPhone 6 Plus and iPhone 6s Plus. You don't need to hold with two finger. You can lay keyboard either left side or right side.
Sometime you can only use one hand, still you can type words.
Only "Fan Like Keyboard" that laid all necessary key in one side. (it doesn't make sense if important key is in other side.)
Sorry no auto correction has been implemented, it is in to-do list.