Coda One is a browser based collection of AI writing tools that includes an AI detector, an AI humanizer, an AI rewriter, and a grammar checker. The primary function of the tool is to help users identify text patterns associated with AI writing, then edit that text to sound more natural and human. The AI detector is free to use with no daily limit and does not require a signup. It analyzes drafts sentence by sentence, highlights patterns that read as machine generated, and reports the reasons for those highlights so users can act on the findings while editing. The AI humanizer is designed to transform AI generated text into natural sounding content for academic, professional, and everyday contexts. It offers nine writing modes, including Standard, Academic, Blog, Formal, and Simple, with four additional premium modes. The humanizer varies sentence length and trims stock connectors to make the draft read more naturally, while preserving the original meaning. The AI rewriter and grammar checker support further refinement of clarity, tone, and correctness. The detector remains free even as users upgrade. Typical workflows include checking a draft for AI patterns before publishing, revising wording for clarity and tone, and integrating the tools directly into a browser based workflow to avoid switching between tabs. For essays and assignments, the intended use is to write the content yourself, use the tools for editing, and disclose AI help where course requirements mandate it. The free tier keeps the product useful from day one, while paid plans, billed through Stripe, add higher AI writing capacity, better modes, and cleaner writing workflows for users with daily or heavy usage. Coda One is a UK registered company.