Women rely on these apps for a range of reasons, from logging their menstrual symptoms, e.g. bloating and cramps, to better understanding their fertility.
“When Maya asks you to enter how you feel and offers suggestions of symptoms you might have — suggestions like blood pressure, swelling or acne — one would hope this data would be treated with extra care,” the report said. “But no, that information is shared with Facebook.”
As for other popular period-tracking apps on the market, such as Period Tracker by Leap Fitness Group, Period Tracker Flo by Flo Health, Period Tracker by Simple Design, and Clue Period Tracker by Biowink, Privacy International has confirmed they haven't been sharing data with Facebook.