# The privacy problems hidden in your period tracker

> **Newsylist Open Intelligence Dossier** · First detected: 2026-07-16 17:29 UTC · Category: Technology · Sources: 9 · Current Velocity: 6.75

## Executive Summary
Privacy concerns surrounding period tracking applications are mounting following research into data-sharing practices.

## Intelligence Brief
Recent studies have identified potential privacy risks associated with period tracking applications. Investigations specifically indicate that the app Stardust has shared sensitive user health information with third-party analytics firms, contradicting previous privacy expectations.


Coverage from outlets including BBC, Yahoo Tech, SC Media, and FemTech World highlights findings from a Mozilla study examining the data practices of these applications. Reports contrast these findings with the Euki app, which Mozilla identified as a more private alternative in its assessment.


Future developments remain dependent on further disclosures regarding industry data-sharing policies. Coverage does not yet specify whether legal or regulatory bodies will initiate formal inquiries into the identified practices.

## Verified Facts & Key Claims
### What has the Mozilla study revealed about Stardust?
The study found that the Stardust period tracker shares sensitive health data belonging to its users with third-party analytics firms.

### Which application was cited for better privacy?
Mozilla research ranked the period tracker Euki as the most private option among those studied.

### Are other apps involved in this trend?
Current coverage focuses specifically on Stardust and Euki, though broader reports highlight general privacy risks hidden within the period tracking sector.

## Key People, Organizations & Locations
Hidden, Mozilla, Stardust Period Tracker Caught Sharing Health Data, Mozilla Study, Period, Stardust, This Period Tracker Promised Privacy Researchers Say It Shared, Health Data Anyway

## Multi-Source Evidence Table
| Source Outlet | Headline | Published (UTC) | Verification URL |
|---|---|---|---|
| Hacker News | The privacy problems hidden in your period tracker | 2026-07-16 20:15 | [Source Link](https://www.bbc.com/future/article/20260715-how-period-trackers-share-womens-private-details) |
| CyberInsider | Mozilla study ranks Euki as the most private period tracker | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMijgFBVV95cUxPcVZERXZ6U1NvYVRtOUY1MTh6eVZhd1lXSG5BZUpiLVNOUTJBREdXZ204Um5NM3hqUEZLWnVYSm9wallFOEdDTHYyZVZzY3dtTU5ibU94eUxac05pWksyTWw2TGROZmNLVVdJbExYdjllLW00Vm40dS02ZHhLeVJ1bG13c2J1b0J3TElhVW5B?oc=5) |
| FemTech World | Stardust period tracker shares health data, study reveals | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMirgFBVV95cUxNN3BGTGFINXlVLWhzOXhyelRmeW9abFFlUDdLVV9oQm9QOS1fTW55TmZGa2FTWWpzZzN3LUNTQnVwWWFMWEgtSXRTdDcwbzJ3SDl3SnNSZjJyWEVmLVRYMmdWVDgydEF6Wk5Uc093NFRsWlJnZXROV0pEeXpFSndaTF85NzhESDYtWVhDYTUzOFlSdms2RGQ5NFMwa2hqNkdWdDg1dDlwOXNvU3lUeGc?oc=5) |
| SC Media | Period tracking app Stardust shares sensitive user data with third parties, report finds | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMiuAFBVV95cUxNT0VKTnpodk5ySzdqX2pJM3NJb01JblY5VUF3d3pITU1VLXQ2Q3RzUUZBSHQ5a1VMWHF0ZVRDWEF1bmRpd1c3Y2ltU1RQR1BRLXVrYmxvNjcwc0hnZGhmNXlYdnZVb1JUYjFNU0hjTURvY3VyampDQXZIbkNHZWFuRXpxYWZWT196ZG1YeEI0Uk5Lem41NkVYRXMyTnBLNG5zNWd3Nnl0MVFvNFo5Rm5GX09FM3NHYWFY?oc=5) |
| All About Cookies | This Period Tracker Promised Privacy. Researchers Say It Shared Users’ Health Data Anyway | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMibkFVX3lxTE43TmJzbWVvdmpaQWpWQk1tcUFsQzhOdWo1WEZWdGM4a2FpVVZINjdKRkQwcmNITnhaNmFGYWpDTnVpUUtHNHpnY1ZoSUhGMmctbWdhLXRmcXFrZmNTU1lzSzBUQmtNa25yTnh6Z0Jn?oc=5) |
| The Tech Buzz | Stardust Period Tracker Caught Sharing Health Data in Mozilla Study | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMiogFBVV95cUxNVktybGRKMktycW5VdDJNQUJ6YUUtUjZZeUtGalFyQUlzRFBCMnl1UjRJc2tJOWFUSlRMMWNnUG1DX0ctVlBHbFBvUEVrMFhBOE9seGZtRWZRQ1lyYThmMGsyVmFvRjdDM1ZlVGdSYWRSS0FjTUlhOTNRaUNRT2RObFBCTlZYaUpQalc4cFdTY2I3VUQyZ2syeTVQSUpyLUE2RXc?oc=5) |
| The News International | Your menstruation tracker may be sharing more than you think: Hidden privacy risks | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMipAFBVV95cUxObTlGX3IxWFNIVnRmZndROFlidWEzaFlrdVZqeXc4VGtORVV4MllzVTQxY2RmczNWN0JveTFqb3lsSjByaXNuZTU3aWpEMXJOQTM5Q0RwZUVFMGxRakFJSWRFUTZzTjFKa2F4bUdLejIwQnRDZGFVeUFxUkpaWXJfaXlOT1RjMEo5bGM0Wkd1X3JKaTlJZ0FOSkpqUVpocGxLTTUxdg?oc=5) |
| Yahoo Tech | Period tracker Stardust shares users’ health data with analytics firm, says Mozilla research | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMingFBVV95cUxNYUFRaU5WdW9aQXB3dFVIYUZuUDROdWxtc1I3RElsODFZajRJRFE2UUlBX1UwczBVTlJkdV9pcURFdk5nbzBSVVhZZHZRSUU1dlY0OEZMalptVnVNdU9JZ0ZzSVRXcW8xMEZOZm9VeWlKa29ObVBwRDEyNlpHUlVuTGRwTUVWeVhsYmhfSEJNMEs1M0htN1QtNjJBWW5Bdw?oc=5) |
| BBC | The privacy problems hidden in your period tracker | 2026-07-16 09:04 | [Source Link](https://news.google.com/rss/articles/CBMilwFBVV95cUxQTERMc0dOcmJib0hZdy1fNkNjVkRrUUozZGUxZ24yUnVXZ1FLM0ZFZ1lDejFJTXA5Q2dvQ1ZSallDcmlaaDFlQ0pxYTVtMjRacWdaTTk4U3VxVWtkOWtkcUpiblRJQU43akNVeXNnbm5GRFpKUldKNUVzNzM1Uzc0SV93NVJuMTRiUkExcHVtNlRWbE9xc3Rn?oc=5) |

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