LumenCycle

Lumen Cycle is a privacy-first period and fertility tracker that works entirely offline. No accounts. No cloud sync. No analytics. Your logs stay on this device unless you choose to export them. SEE YOUR CYCLE CLEARLY A dark, calm calendar highlights period days, fertile windows, and estimated ovulation so you can understand your cycle at a glance. Tap any day to log, or jump months quickly when you need history. LOG WHAT MATTERS Record flow intensity, basal body temperature (°F or °C), cervical fluid, intimacy, and grouped symptoms — physical, mood & sleep, and digestive/other. Notes stay private on your phone. ON-DEVICE PREDICTIONS Lumen Cycle estimates your next period, fertile window, and ovulation using your past period starts (modified Ogino-Knaus calendar method). Predictions are estimates for personal awareness — not birth control and not medical advice. HISTORY & TRENDS Charts show cycle length, period length, basal temperature trends, and which symptoms you logged most this month. FACE ID PROTECTION Require Face ID (or device passcode) when you open the app and when you return from the background, so your cycle data isn’t visible at a glance. EXPORT WHEN YOU NEED IT Premium unlocks PDF summaries for doctor visits (last 3 months), plus JSON and CSV exports to the Files app. FREE TO START Your first month of logging is free. When you’re ready, unlock everything forever for $2.99 — one payment, no subscriptions, no add-ons. Privacy isn’t a setting in Lumen Cycle. It’s the product.