Cmd J is an AI-powered Chrome extension that allows users to supercharge their productivity. It provides an easy way to improve writing, get answers to coding questions, and generate blog posts with a simple Cmd/Alt + J keyboard shortcut. The extension is powered by ChatGPT, a natural language processing (NLP) tool that provides human-like answers and explanations for coding issues. It also helps users draft blog posts and social media posts if they are stuck, and provides results from Google searches without having to search through multiple pages. Cmd J is available in four different pricing plans, with varying levels of access to OpenAI requests, response time, and support. The free plan includes login interruptions, while the paid plans offer unlimited requests and faster response time.