Stardust

Stardust is a free period, ovulation, and pregnancy tracking app that layers astrology and AI-generated insights on top of standard cycle tracking. Users log symptoms and cycle data day by day, and the app maps hormonal phases against lunar phases and astrological signs, pairing daily horoscope updates with health-oriented insights about where someone is in their cycle. It is women-founded and women-run. Beyond core tracking, Stardust offers mood logging, personalized cycle insights, and social features for syncing with friends. Unlike many period trackers that gate features behind a paywall, Stardust is entirely free to use, with no premium subscription tier required for its main functionality. The company states it encrypts user data so that Stardust itself cannot access, view, or sell users' personal cycle data, a notable privacy claim in a category where health-app data handling has drawn scrutiny elsewhere. The app is available on iOS and Android and targets people who want cycle tracking that goes beyond dates and symptoms into a more reflective, astrology-inflected framing of hormonal health. Its blend of astronomy and astrology alongside health tracking is a distinguishing feature, though this same framing means it will not appeal to users who want a purely clinical, data-only period tracker.