Period App Shares Sensitive Data Unknowingly

A recent investigation by Mozilla has revealed that the period tracking app Stardust shared sensitive user health data with a third-party analytics firm, RudderStack. The data transmitted included personal details such as birthdate, reproductive goals, symptoms, and birth control information, linked to a unique identifier. Mozilla's research, which analyzed the network traffic of several period tracking apps, found Stardust to be the only one sharing such intimate health details.

This practice contradicts Stardust's own claims of user privacy and end-to-end encryption. While a Stardust spokesperson stated that RudderStack is contractually prohibited from misusing the data, both U.S.-based companies remain subject to law enforcement demands for user information. In contrast, Mozilla's research highlighted the Euki app as a privacy-conscious alternative, noting that its core features do not share data externally and user health information remains on the device.