A private assistant that one person runs on his own computer.
ant helps its owner with his own mail, his task lists and his home. It runs on a machine he owns. It is not a service: nobody else can sign up for it, sign in to it or use it.
Where ant reads his mail, it does so with his permission, given in his own Google account, and only for him. It changes something in his mailbox only when he taps to approve that change.