When we contacted Clue, a spokesperson told Refinery29 that the company "does not share any of our users' personal health or menstrual cycle data, nor do we sell any user data to any third-party service, and we never will."

What does Clue app do with data?

Clue gives anonymized data to scientific researchers, encrypts its identifying information separately, and discloses all of its research projects in detail on its website.

Do period tracking apps sell data?

In a statement to Insider, a spokeswoman for Clue said the app doesn't send these companies any health data, and that they are used for internal analytics and functions including in-app messaging and notifications.