SupWriter is an AI writing assistant and humanizer built for founders, students, and marketers who draft with AI. Paste any AI-generated draft and SupWriter rewrites it so it reads the way a person would actually write: clear, natural, and free of robotic phrasing, while your original meaning stays intact. It also runs a built-in detection check against the major AI detectors (Turnitin, GPTZero, Originality.ai) so you can verify the output before you publish. SupWriter works on the web, as a Chrome extension, on mobile, and through a developer API plus an MCP server for AI agents like ChatGPT, Claude, and Cursor. There is a free plan with no credit card required, and paid plans start at $9.99/month for higher volume.