UpWrite AI is a Chrome extension that acts as an AI-powered writing assistant, proofreading and correcting text across most websites. It checks for typos, grammar, and semantic errors, and can adjust tone, style, and audience. The extension provides educative corrections, explaining mistakes to help improve writing skills. It supports multiple languages and offers a pay-as-you-go pricing model with word tokens, avoiding subscriptions. Registration is quick via Apple or Google accounts.