Period Cycles vs NerdCycle

We believe your health data belongs to you—and only you. With a clean, intuitive interface and powerful prediction algorithms, tracking your cycle has never been easier or more secure. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

NerdCycle is the cycle tracker designed for two — track your period, fertility, and daily wellness, and share it with your partner. No accounts. No data collection. Everything stays on your iPhone and your private iCloud. WHY NERDCYCLE • Built for couples — share your cycle data with your partner so they can see what phase you're in and how to be supportive • Privacy first — no analytics, no third-party tracking, no servers in the loop • Beautiful pixel-perfect design with light and dark modes • 7-day free trial. Yearly subscription or one-time lifetime purchase CYCLE TRACKING • Period predictions with confidence indicators • Fertile window and ovulation forecasting • Phase-aware insights for menstrual, follicular, ovulation, and luteal phases • Cycle regularity score and prediction accuracy stats • Daily tips tailored to your current phase DAILY LOG • Mood, flow, energy, sleep, symptoms • Custom symptoms — add your own • Water intake, exercise, basal body temperature (BBT) • Cervical mucus (when you're trying to conceive) • Quick notes for every day PARTNER MODE • Invite your partner with a private iCloud share — just send one link • They see your phase, alert level, and partner-specific guidance • Conversation tips, support kit, and "do today" suggestions tailored to her phase • Stop sharing anytime in Settings INSIGHTS & CHARTS • Cycle length history and trend • Mood and sleep correlations • Top symptoms by phase • Energy and sex drive patterns • BBT chart with ovulation shift detection • Monthly summary reports APPLE INTEGRATIONS • Apple Health: optional — writes period days and BBT, reads sleep, water, exercise and temperature • Home screen widgets for quick cycle check • Live Activity on Lock Screen and Dynamic Island • Notifications for upcoming period, fertile window, and partner phase changes EXPORT YOUR DATA • CSV export for your records • PDF doctor report for clinic visits • Delete everything anytime in Settings PRICING NerdCycle is free to download with a 7-day free trial. After the trial, choose one of two options: • Yearly Subscription — $9.99 per year, auto-renewable • Lifetime — $29.99 one-time purchase Subscriptions auto-renew unless cancelled at least 24 hours before the period ends. Manage or cancel in iOS Settings → Apple ID → Subscriptions. Privacy Policy: https://vladoivankovic.com/NerdCycle/privacy.php Terms of Use: https://vladoivankovic.com/NerdCycle/terms.php NerdCycle is not a medical device. Predictions are estimates — always consult a healthcare professional for medical decisions.