Your gentle cycle companion
Lumi is a private period tracker for iPhone. Log how you feel, see what’s coming, and ask questions. Your cycle never leaves your phone.
- 🔒 Private
- ✨ On-device AI
- 💜 Free
A calendar with a friend
Lumi holds your month, reacts to how you feel, and gently tells you what’s ahead.
Everything you need, nothing you don’t
Every feature is free. No subscriptions, no ads, no account.
Log in a tap
Tap a day to mark your period and flow, or tap Lumi to log how you feel.
See what’s coming
Predicted periods, PMS days and an ovulation estimate that learn from your own cycles.
Ask Lumi
Ideas for food, movement, mood and rest in each phase, plus an AI chat that runs fully on your iPhone.
Insights
Your cycle history, recurring symptoms and cycle-length trends at a glance.
Lumi’s Room
Play with Lumi, breathe together, try on outfits, decorate with stickers and pick an app icon.
Plan a trip
Pick your travel dates and see if your period might come along.
Your cycle stays on your iPhone
Most trackers send intimate health data to their servers. Lumi doesn’t have any. Everything you log is stored on your device.
Read the privacy policy- No account or sign-up
- No cloud, no health server
- No ads, analytics or tracking
- AI answers made on your phone
- Optional Face ID app lock
- Export, import or delete anytime
Lumi is a wellness app, not a medical device. It does not diagnose, treat or prevent any condition, and ovulation estimates are not a form of birth control. Talk to a clinician for medical decisions.