Donna

A private personal assistant, built and run by one person for their own use.

This is not a public service. Only the owner can sign in. Nobody else can create an account, connect a Google account, or use the assistant.

What it does

Donna answers the owner's questions in a private chat: notes, reminders and projects. With the owner's permission, it can also look at their own Google account to answer questions such as "What's on my calendar today?" or "Any unread email from this week?"

Google access

Read-only. Donna can search and read Gmail messages and read Google Calendar events and free/busy times. It cannot send, delete, label or change mail, and it cannot create or edit calendar events.
One account. Donna connects only to the owner's personal Google account, after the owner signs in through Google's own consent screen.
Revocable. The owner can remove access at any time at myaccount.google.com/permissions.

How that data is handled is described in the Privacy Policy.