Rex: AI Writing Assistant

Correct and refine your writing with AI

Rex is an AI writing assistant that helps you correct, refine, and improve English text wherever you write online. Whether you are writing emails, comments, posts, forms, messages, support replies, or documents in the browser, Rex helps you quickly turn rough text into clearer, more polished writing. Key features: • Grammar, spelling, and punctuation correction: Rex helps clean up writing mistakes while preserving your original meaning. • Tone refinement: Choose from Professional, Casual, Academic, or Friendly tone depending on the context. • Popup writing tool: Open Rex from the Chrome toolbar, paste or type text, choose a tone, and generate a refined version. • Inline live refinement: Use Rex directly inside text fields, textareas, and supported modern web editors. When you are writing on a page, Rex can show an inline refinement popup so you can copy or apply the improved text without switching tabs. • Apply suggestions instantly: Use the Apply button to replace the current text with the refined suggestion in supported inputs and editors. • Copy refined text: Prefer manual control? Copy the suggestion and paste it wherever you want. • Clear usage and plan status: Free users can see daily usage. Pro users get unlimited daily refinements and higher per-request character limits. • Privacy-conscious design: Your text is sent to Rex servers only to generate the requested refinement. Rex does not store your writing or use it for training. Who Rex is for: Rex is useful for: • Non-native English speakers who write online • Professionals writing emails and business messages • Students and researchers refining academic text • Support, sales, and operations teams writing customer-facing replies • Anyone who wants clearer, more natural English Plans Free: • 10 successful refinements per day • Up to 2,000 characters per refinement Pro: • Unlimited daily refinements • Up to 5,000 characters per refinement Rex is designed to be lightweight, focused, and easy to use. It works from the browser toolbar and directly inside many common writing surfaces on the web.