Period-Tracking Apps Are Monetizing Women’s Extremely Personal Data

More than 100 million women monitor their cycles on their phones. Here come the ads.

illustration: Cristina Daura for Bloomberg Businessweek

By Naomi Kresge, Ilya Khrennikov, and David Ramli

Sarah Martin, a Berlin-based aid worker who specializes in women’s issues, used to track her periods in the same paper planner where…

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