Sync vs Period Tracker

Sync Period tracks cycles locally and supports private sharing with a partner or friend. Log periods, symptoms, moods, and notes; view your calendar and pattern summaries; set optional reminders; and import supported Flo, Clue, Drip, or generic CSV data after reviewing what Sync can recognize. Your cycle history is encrypted on your device. Private predictions adapt to your recent cycle history and confirmed corrections entirely on your device. Sync shows a likely-start window and confidence level, learns recurring pre-period patterns, and can use an enabled BBT signal or positive ovulation test without uploading those health details. Predictions become more cautious when history is sparse or variable. Partner sharing is optional and off by default. You choose which supported cycle details to share. Updates are end-to-end encrypted and require the complete private invite to open. Each encrypted relay update expires after no more than 30 days; active sharing renews that rolling expiration when a new update is published. Recent physical symptoms and flow, sex-drive and intimacy check-ins, and moods are three separate opt-ins that can each be turned off again. Intimate sharing is off by default and never indicates consent. Discharge, medications, written notes, and other sexual details remain private. Sync Period has no ads, no behavioral analytics SDKs, and no required account. You can export a private backup or permanently delete local app data at any time. Cycle predictions and pattern summaries are estimates. Sync Period does not provide diagnosis, contraception, or medical advice.

Take complete control of your menstrual health with Period Tracker: Cycle & Sync, the modern, beautifully designed period and cycle tracker built for you—and your partner. Whether you are tracking your period, analyzing cycle phases, or logging daily symptoms, our app provides intelligent insights tailored to your unique body. KEY FEATURES: NATIVE HOME & LOCK SCREEN WIDGETS Stay updated without even opening the app. View your current cycle phase, day counter, and period predictions right on your home screen and lock screen. ACCURATE PERIOD & OVULATION TRACKING Log period start and end dates with a single tap. Our intelligent prediction algorithm learns from your cycle history to forecast your next period, ovulation day, and fertility window. DYNAMIC CYCLE PHASE GUIDANCE Understand the four key phases of your cycle: Menstrual, Follicular, Ovulation, and Luteal. Enjoy a dynamic dashboard that adapts colors and surfaced health insights based on your exact phase. INNOVATIVE PARTNER MODE & DATE PLANNER Stay in sync with your partner. Share cycle phases and period countdowns, and discover cycle-aware date ideas and care recommendations designed for each specific phase. Fosters empathy and closeness with customizable privacy settings. COMPREHENSIVE SYMPTOM & MOOD LOG Easily record symptoms, flow intensity, mood triggers, and energy levels. Gain deeper self-awareness with intuitive trend charts and historical pattern breakdowns. 100% PRIVATE & 100% FREE No ads, no subscriptions, no paywalls, and no hidden fees. Your health data remains private on your device with optional Face ID / Fingerprint biometric lock.