Luna: Private Cycle Tracker

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.

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