A college project became a writing business by giving people another way to say what they meant. Now QuillBot is betting that the same audience wants help creating much more than sentences.

The AI writing assistant is at its best when the thought is already yours and the sentence refuses to cooperate. Here is where Wordtune earns a tab, where it gets fussy, and which plan is actually worth paying for.
A Ukrainian-founded grammar checker became a $700-million-plus business by showing up wherever people type. Its next bet is bigger and riskier: turning that distribution into an operating system for work.