A registered account and premium subscription is necessary to use this add-in and can be bought at https://quillbot.com.
QuillBot is a paraphrasing tool that uses machine learning to reword and restructure sentences or paragraphs. It functions like a full-sentence thesaurus. Users can simply right click a sentence and hit "Launch QuillBot" to rephrase the sentence. Users can then edit the output on the side panel and insert it into their document.