QuillBot

QuillBot is an AI-powered writing assistant best known for its paraphrasing tool, which rewrites and rephrases text while preserving the original meaning. The platform bundles several writing aids, including a grammar checker, summarizer, citation generator, plagiarism detector, and translator, all aimed at helping people polish and refine their writing.

The service is popular with students, academics, writers, and professionals who want to improve clarity, adjust tone, or condense long passages. Its paraphraser offers multiple modes, such as standard, fluency, and formal, giving users control over how much the wording changes. Browser extensions and integrations bring these tools directly into documents and web apps.

Founded in 2017 and now part of the Learneo family of learning products, QuillBot operates on a freemium model. A free tier covers core features with limits, while a paid premium subscription unlocks faster processing, longer inputs, and additional writing modes.