""Improve"" your writing, maybe. It started as a joke, we simulated with some friends, in a telegram group, a game where you write, but the game favor using words not commonly used, and it assign a score to your writing in realtime. In our "simulation" we scored ourself (that was the joke):

"that was part of the peculiarity +12 of the game."

see how I've put a random :) value next to a word? Wouldn't be cool if that is assigned by the "game"?

Well from that evolved, what if I write a "system" that can do that anywhere and in any app you use? And then it hit me, that is a mobile keyboard! So, it is an experiment at this point, I'm building it.