RewriteBar is a tool designed to enhance writing in any macOS application using AI assistance. The tool allows users to swiftly rectify grammar errors, shift writing styles, and translate content. It can be efficiently used in any application including Slack, code editors, or Figma documents, with no need for switching or copying-pasting content. It can be used to swiftly fix grammar and spelling errors and adjust the tone of the written content based on the context. RewriteBar also supports quick translation of words, sentences, or even code snippets to different languages. This tool is designed to seamlessly integrate into macOS and can be customised with keyboard shortcuts to trigger actions, thus accommodating and boosting individual workflow. Users can use their own OpenAI API key, which directly links with the tool for text correction. After making a purchase, users receive a personal license key and instructions on how to install the app. The tool requires macOS 13.0 (Ventura) or later versions to function.