GhostWriter by MyHandler

Every other AI writes what you tell it. Ghostwriter writes what you already know. Double-tap Left Ctrl in any text field, in any app, and the reply is there — drawn from the thread on screen, your calendar, your files and your past meetings, indexed in an encrypted vault on your PC. It won't double-book you, and it matches how you write to that person, down to the sign-off. Then it stops: it types into the box and never sends. Windows.