The Best Writing & Productivity AI Assistant for macOS

RewriteBar is a macOS application that brings AI-powered writing assistance directly into your workflow. It works system-wide, meaning you can select text in any application—whether it's your email client, a messaging app, or a document editor—and activate RewriteBar with a simple keyboard shortcut. The tool then provides a menu of actions to improve your text, including fixing grammar and spelling errors, translating between languages, changing writing styles, or applying custom transformations. This eliminates the need to copy-paste between different apps or websites to get AI writing help.

What makes RewriteBar stand out is its deep integration with the macOS ecosystem and its flexibility. It offers PopClip integration for quick access and supports both cloud-based and local AI models, including Ollama and LM Studio, giving users the option to process text locally for maximum privacy and speed. The ability to create custom workflows is particularly powerful—you can chain multiple actions together, like expanding text, adding emojis, and then translating it, all in one go. The side-by-side comparison feature lets you review changes before applying them, ensuring you maintain control over your writing.

This tool is ideal for anyone who writes frequently on a Mac and wants to improve their efficiency and writing quality. Professionals who send a lot of emails, content creators drafting social media posts, students writing papers, or developers documenting code will find immediate value. Real-world use cases include quickly translating a paragraph in a research paper, fixing typos in a business proposal before sending it, or converting meeting notes into actionable to-do lists without ever leaving your current application.