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Fertility & Cycle AI is a privacy-first cycle, fertility, hormone, and symptom tracker for iOS 17+, iPadOS, macOS, and watchOS 10+. This page covers the most common questions. If something isn't here, email us.
1. Pick a goal. During onboarding choose Track my cycle, Plan a pregnancy, or Fertility awareness. You can change this later in Settings.
2. Log your first period. Tap the Calendar tab → select a date → mark period start. The app learns from your logs — predictions improve after 2–3 cycles.
3. Grant optional permissions (as you want them). Notifications, Face ID / Touch ID, and Apple Health are all optional. The core tracker works without any of them.
Q: How accurate are the predictions?
Predictions improve with data. Expect the first cycle to be a rough estimate based on the average you entered in onboarding; by the third logged period the app adapts to your personal pattern. Fertile window and ovulation estimates are based on cycle length, BBT (if logged), and ovulation test results (if logged).
Q: Why did my predicted period shift?