Luna - Private Period Tracker

Luna tracks your period, predicts ovulation, and plans your life — 100% offline on your phone. No account. No cloud. No ads. Just open and start tracking.

TRACK EVERY LIFE STAGE — ONE APP

Luna isn't a basic period calendar. It's a menstrual cycle companion that adapts to your reality:

• STANDARD: Track your period, predict ovulation, and see your cycle phase on an interactive fertility calendar.
• TRYING TO CONCEIVE (TTC): Log BBT, LH tests, and cervical mucus. Get a daily fertility brief explaining your peak conception window — no guesswork.
• PREGNANCY: Follow your baby's development week by week. Log symptoms and track gestational milestones.
• PCOS & IRREGULAR CYCLES: No fake 28-day assumptions. Luna suppresses wrong countdowns so you stop stressing about a "late" period that's just your biology being biology.
• PERIMENOPAUSE: Log hot flashes, sleep changes, mood shifts, and transitional cycles in a simple, judgment-free view.

UNDERSTAND YOUR BODY LIKE NEVER BEFORE

Ever wonder why Day 22 always hits different? Luna connects the dots:

• See how sleep, caffeine, and exercise affect your symptoms
• Spot recurring symptom clusters and mood trends across your cycle
• View multi-year analytics and cycle trends — all analyzed on your phone, never a server

SHARE YOUR CYCLE, NOT YOUR SECRETS

Sync cycle phases with your partner using encrypted QR codes. They see phase context and daily tips — never your symptoms, moods, or private notes. No cloud. No accounts. Just a private connection between two phones.

SWITCH FROM OTHER APPS — KEEP EVERY LOG

Upload your old calendar screenshots and Luna imports your history right on your phone. No server upload. No data leaves your device. Your past follows you — privately.

THE PRIVACY OTHER APPS CAN'T MATCH

Most period trackers store your intimate data on their servers. When a subpoena arrives, they hand it over. Luna can't — because Luna never has it.

• No account, no sign-up, no email — Luna doesn't know who you are
• All data stored exclusively on your device
• Discreet lock screen alerts disguise period reminders from prying eyes
• Independent PIN and biometric locks protect your logs
• Encrypted backups you control — not us

While popular trackers were recently rated as low as 2/10 for privacy, Luna was built so there's nothing to leak.

100% AD-FREE

Zero banner ads. Zero video ads. Zero ad SDKs. Luna is funded by optional premium upgrades — never by selling your data.

FREE FOREVER — PREMIUM WHEN YOU'RE READY

The core fertility tracker and period diary is completely free with no trial and no expiration:
• Log periods, symptoms, moods, and private notes — unlimited
• Period predictions, color-coded menstrual calendar, and safe period calculator
• PIN/biometric security and encrypted backups
• Period reminders and discreet notifications

PREMIUM unlocks advanced planning:
✓ See your next 3 months of periods, fertile windows, and PMS days at a glance
✓ Daily TTC fertility briefs and pregnancy week-by-week guides
✓ On-device symptom and habit correlation insights
✓ Partner sharing capsules
✓ Clean PDF health reports for your doctor
✓ Extra themes and accent colors

Only need one report? PDF export is also available as a standalone purchase.

Luna supports English, German, Spanish, French, Dutch, Chinese, Japanese, Hindi, Bengali, Indonesian, Malay, and Thai.

Luna is an educational women's health logging and planning tool. It does not replace medical advice and is not an FDA-cleared contraceptive method.