QuillBot

QuillBot is an AI-powered writing assistant that paraphrases, checks grammar, summarizes, and rewrites text to improve clarity, tone, and correctness. It's built mainly for students, academics, and professionals who write frequently, and its standout feature is a flexible paraphraser with multiple modes and a synonym slider that lets users control how much of their text gets reworded. Owned by Learneo, it works across the web, browser extensions, and Microsoft Word.