Period tracker Stardust shares users’ health data with analytics firm, says Mozilla research
Mozilla research found that Stardust, a period tracking app, shares users' health data with a third-party analytics firm. The findings reveal significant variation in privacy practices across period tracker apps, with at least one app handling data responsibly while Stardust did not.
Why this matters: Period tracking data is not generic health information. It can reveal pregnancies, fertility decisions, and reproductive choices — exactly the kind of data that can be used against people in states where abortion is restricted. Stardust built its brand on privacy after Roe was overturned. Users who chose it specifically for that reason deserved to know their data was going to an analytics company. When an app's privacy promise is the product, breaking that promise is not a minor policy detail. It is the whole problem.
Who should care: Healthcare professionals · Privacy officers · Compliance · General readers · Policy
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