QuillBot

Overview QuillBot is the AI paraphrasing tool that quietly became the default reword and summarize utility for students, ESL writers, content marketers, and anyone who spends more time reshaping other people's copy than writing from scratch. Founded in 2017 by three University of Illinois grads and acquired by Course Hero (now Learneo) in 2021, it now runs across a browser extension, a web editor, Microsoft Word, Google Docs, and mobile — and its parent company owns enough adjacent education properties that QuillBot data flows quietly into a much bigger content pipeline than most users realize. What QuillBot actually does, cleanly stated, is rewrite the sentence in front of it. You paste a paragraph, pick one of eight paraphrase modes — Standard, Fluency, Formal, Simple, Creative, Expand, Shorten, and the newer Academic — and the model returns a rewrite. The synonym slider decides how aggressively it swaps words. The result is not always better, but it is almost always different, which is what the tool exists for. Around that rewrite engine QuillBot has stapled a grammar checker, a summarizer, a plagiarism checker, a citation generator, an AI detector, and a translator. None of those side products win their category on their own. The rewrite engine still does. The one line positioning: QuillBot is the tool you pay for when your writing job is mostly rewriting, summarizing, and repurposing rather than drafting from a blank page. It is not a Grammarly replacement — Grammarly out polishes it on subtle grammar — and…