Period Tracker Stardust Faces Privacy Concerns Over Data Sharing

WHO:

TechCrunch - Stardust is a period tracker app.

BBC - A spokesperson for Stardust provided information regarding data sharing practices.

WHAT:

TechCrunch - Mozilla tested multiple period tracker apps, revealing that one app was "squeaky clean" while Stardust was found to be sharing users' health data with an analytics company.

BBC - Stardust claims it uses RudderStack solely as a "technical pipeline" for routing data into its own analytics systems.

WHERE:

TechCrunch - The testing of the period tracker apps was conducted by Mozilla, which is based in the United States.

WHY:

BBC - The spokesperson for Stardust stated that the app does not share identifiable information with RudderStack, which is contractually prohibited from selling or using the data for its own purposes.

HOW:

BBC - RudderStack does not store the data long-term, according to the spokesperson for Stardust.

(UPDATED July 16, 2026 16:22 UTC)

A recent investigation by Mozilla revealed that Stardust, a period tracker app, has been sharing users' health data with an analytics company, while another app tested was deemed "squeaky clean." A spokesperson for Stardust clarified that the app uses RudderStack merely as a "technical pipeline" for routing data, asserting that identifiable information is not shared and that RudderStack is contractually prohibited from selling or using the data for its own purposes. Furthermore, the spokesperson emphasized that RudderStack does not store the data long-term.