This is the Rhyming Keyboard. Any word you type will be replaced with a word that rhymes. The Rhyming Keyboard only knows about some English words, and it won't be able to rhyme with words it doesn't recognize. It also doesn't try to rhyme with words that have fewer than three letters.
The Rhyming Keyboard can do anything that any other keyboard can do: you can select, cut and paste, use keyboard shortcuts, etc. Try pasting in chat transcripts or political speeches or famous poems. Enjoy!
I'm Allison Parrish and I made this. Follow me on Twitter or look at some other weird text interfaces I've made.