Inbox AI is a voice-driven automation tool for Mac that integrates with various applications, enabling users to perform tasks, process emails, and capture information through voice commands. It allows users to build custom AI-powered assistants that can draft emails, remember past interactions, rewrite or discuss text, search the web, and perform various other actions like transcribing text or opening apps. The tool also automates email management by filtering junk, extracting tasks, and sending them to apps like Notion or Obsidian. With privacy-focused AI, it operates fully offline or with online capabilities for increased power.