Muse

Muse is Meta's personal AI agent for Mac, iPhone, Android, and WhatsApp, built to handle real-world tasks like browsing sites, filling forms, and completing purchases on a user's behalf rather than just answering questions. It stores credentials in a secure vault and, for purchases, can generate one-time virtual card numbers so a merchant never sees a user's real card details. Every action the agent wants to take — booking, buying, or sending something — requires explicit approval first, and every completed action is logged in an audit trail the user can review. On macOS, Muse can also integrate with local files, apps, and open browser tabs to pull context for a task. It is free to use, with no published paid tier as of this listing.