Niah: Private Period Tracker

Niah is the private period and cycle tracker that keeps your most personal data exactly where it belongs — on your phone. Log your period in a single tap, track symptoms and mood, and get clear, honest predictions for your next period and fertile window. Niah learns your rhythm and handles irregular cycles gracefully — showing a range instead of pretending every cycle is the same. WHY NIAH • Truly private — no account, no cloud, no tracking. Your data never leaves your device. • Works completely offline. • Calm, beautiful design with a cycle ring, calendar, and insights. • Honest predictions, even for irregular cycles. • Passphrase-encrypted backups you control — export and import your data anytime. TRACK WHAT MATTERS • Period start, end, and flow • Symptoms and mood — a rich, tap-to-log library • Cycle length, period length, and regularity trends • Trying to conceive? Log basal body temperature (BBT), ovulation tests, and cervical mucus • Gentle period reminders FERTILITY & INSIGHTS Fertility and ovulation predictions and advanced cycle insights are all included — no subscription, nothing to unlock. Niah also supports perimenopause and pregnancy tracking, syncs two-way with Apple Health, and brings your cycle to your wrist with an Apple Watch app and home-screen widgets. Niah is period tracking the way it should be: private, accurate, and calm.