Apple version[0], Microsoft's take [1], related research by Google [2]. My Google keywords were 'smartphone keyboard dynamic touch targets' btw.

[0] https://www.cnet.com/news/iphone-keyboard-learns-what-you-ty...

[1] https://www.microsoft.com/en-us/research/wp-content/uploads/...

[2] https://static.googleusercontent.com/media/research.google.c...

Swiftkey has a "tap map" screen[0] that shows the adjustments it's made.

[0]: https://i.imgur.com/q42xiqg.jpg

It was in a video about the early development of the iphone IIRC, they were discussing how much detail went into the keyboard. I don't have the url in mind right now sorry.

I believe the first version of the iPhone OS did this. It was terrible (often it was literally impossible to type the thing you wanted) and they quickly replaced it with autocorrect instead.

hm interesting, from memory it was a bit of glorifying the history of the iphone and its innovation, so maybe they hid how user felt. But to me it felt like real great work...