Luma is a simple period and symptom diary that keeps your data on your phone. Log bleeding, pain, mood and symptoms in a few taps, add a note, and see your history on a calendar. Export a PDF or CSV for a date range to share with your doctor, with personal notes left out by default. The diary is encrypted on the device, works offline and needs no account. Luma records what you log; it doesn't predict ovulation or fertile days.