Luna vs PrivateCycle

Luna is the period and fertility tracker that keeps your most personal health data exactly where it belongs — on your device. No accounts. No cloud sync. No data sharing. Just intelligent, private cycle tracking powered entirely by on-device machine learning. YOUR DATA NEVER LEAVES YOUR PHONE Luna was built from the ground up with privacy as the foundation. Every prediction, every insight, every log entry is processed and stored locally. We can't see your data because it never reaches us — not even anonymized. SMART PREDICTIONS, PRIVATELY POWERED Luna's on-device ML model learns your unique cycle patterns over time, delivering increasingly accurate predictions for: Period start and end dates Fertile windows and ovulation estimates PMS and symptom pattern recognition Cycle length trends and irregularities TRACK WHAT MATTERS TO YOU Daily symptom and mood logging Flow intensity and duration Basal body temperature (BBT) Cervical mucus and ovulation signs Intimacy and contraception notes DESIGNED FOR EVERY BODY Luna adapts to irregular cycles, post-hormonal transitions, perimenopause, and more. There's no "normal" cycle — Luna learns yours. BUILT FOR TRUST At a time when reproductive health data has never been more sensitive, Luna takes a firm stance: what happens on your phone stays on your phone. No account required to get started. No subscription needed to unlock your own data.

PrivateCycle is a privacy-first period, cycle, and ovulation tracker that keeps 100% of your health data on your device. No account. No sign-up. No ads. No telemetry. No third-party data sharing — ever. Your body is your business. Log your period, symptoms, mood, and fertility signals in seconds, and get clear, honest predictions for your next period, fertile window, and ovulation — all computed locally on your iPhone. WHY PRIVATECYCLE • Local-first: core tracking, predictions, and insights work with no internet and no account. • Your entries are stored in an encrypted database on your device (AES-256). • No ads. No data sale. No hidden trackers or third-party SDKs. • Transparent predictions that are honest about uncertainty instead of faking precision. • Core tracking is free, forever. TRACK WHAT MATTERS • Period flow — light, medium, heavy, clots — with start and end logging. • Symptoms: cramps, headache, tender breasts, bloating, fatigue, acne, backache, nausea, hot flashes and more. • Mood and feelings, energy, sleep, cravings, digestion. • Discharge, sexual activity and drive. • Measurements: basal body temperature, weight, water, sleep hours, LH and pregnancy tests. HONEST PREDICTIONS • Next period date with a prediction window, not a false exact day. • Fertile window and estimated ovulation day. • Current cycle phase and a plain-language confidence level. • Irregular cycles and late periods are explained, never silently guessed away. SEE YOUR PATTERNS • A full cycle calendar with an at-a-glance legend. • Cycle history and averages. • Insights into how your symptoms move with your cycle. MODES FOR EVERY LIFE STAGE • Cycle tracking. • Trying to conceive. • Pregnancy — gestational age, due-date countdown, weekly summary. • Perimenopause — symptom logging and an irregularity view. PRIVACY BUILT IN, NOT BOLTED ON • Your data never leaves your device by default. • App Lock with Face ID or Touch ID keeps your entries yours. • Full data ownership: export to JSON, CSV or plain text, passphrase-protected local backup and restore, and one-tap delete-everything. • Reminders are scheduled locally on your device. PLUS — ONE-TIME UNLOCK, NO SUBSCRIPTION Upgrade once inside the app to unlock: • An on-device AI health assistant — private answers, with nothing leaving your phone. • Advanced insights: your body's patterns, symptom forecasting, and lifestyle-to-symptom correlations. • A clinician report — a formatted, date-range summary to bring to your doctor. • The full pregnancy experience: week-by-week development, body changes, daily tips, kick counter, contraction timer, appointments and checklist. • Full perimenopause: symptom-burden view, timeline and milestones. • Advanced reminders. No ads, no subscription, and the same privacy guarantees. Buy once, keep it. PrivateCycle provides general educational information about menstrual and reproductive health. It is not a medical device and does not provide medical advice, diagnosis, or treatment. It is not a contraceptive and should not be relied on to prevent pregnancy. Always consult a qualified clinician about your health. Download PrivateCycle and take control of your cycle, privately.