Underdog is a locally running AI assistant for Mac that handles email, calendar, meeting notes, dictation, and browser-based errands without sending data to the cloud. It connects directly to Gmail, Outlook, and Google Calendar, keeping all credentials and AI processing on the user's device. Underdog transcribes meetings and voice dictation on-device, and can browse the web to book flights, reserve tables, or cancel subscriptions with user approval. It also monitors data-broker sites and sends removal requests to reduce the user's digital footprint.