Iris
Iris is a private assistant for one person. She runs on her owner's own computer and is not offered to anyone else. There is nothing here to download, buy or sign up for.
What she does with Google
Her owner signs her in on Google's own sign-in page. With that permission she reads her owner's Gmail messages and Google Calendar entries, so that she can tell her owner what the day holds and what needs an answer.
She can only read. She cannot send, delete or change anything at Google, and Google itself holds her to that.
Where it is kept
What she reads is kept on her owner's own computer. Nothing is sold and nothing is used for advertising.