To address your concerns about privacy: we request an OAuth token from Gmail. While this token expires after 1h, we actually use it only once and we never store it anywhere. We analyze your email habits exclusively by looking at metadata, not at the content of emails.

Now, the app is mostly an experiment on email: while most modern communication are shared by default, emails is still completely siloed. We are allowing people to compare their email habits, without, in fact, exposing private information.