SupWriter
What Is SupWriter?
SupWriter is an AI writing tool focused on humanizing AI-assisted drafts while keeping the writer's original meaning and voice. You can paste writing from ChatGPT, Claude, Gemini, DeepSeek, or other AI models and have it rewritten with different sentence structures, wording, rhythm, and tone.
It is also a general writing workspace rather than just a humanizer. SupWriter includes an AI detector with sentence-level highlights, a paraphraser with Standard, Formal, Casual, Academic, and Creative modes, and a grammar checker with Basic, Thorough, and Style modes. Its editor also lets you select individual passages and ask the AI to improve, shorten, lengthen, or fix them.
SupWriter supports more than 50 languages and can be used through its website, Chrome extension, iOS app, API, MCP server, and command-line tool. It also provides integrations for using its writing functions inside tools such as Claude, ChatGPT, Cursor, and VS Code. New accounts receive 300 free words to try the service.
SupWriter Pricing
Pricing Type: Free Trial
Starts from: $9.99/month
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