Menstrual cycle tracking apps are likely collecting and sharing sensitive user data, posing significant privacy risks. These apps often gather intimate details, including sexual activity and physical symptoms, which can be exploited by third-party advertisers and data brokers. The lack of transparency in data handling practices by these apps has raised concerns among privacy advocates, who warn that such information can be used to build detailed profiles of users1. Furthermore, the potential for this data to be used in targeted advertising or even insurance and employment decisions is a major concern. The collection and sharing of such sensitive information without explicit user consent underscores the need for stricter regulations and more robust data protection measures. So what this means for practitioners is that they must prioritize educating users about the potential risks associated with using these apps and promoting more secure and private alternatives.