Niah: Private Period Tracker

Your cycle, beautifully private. Niah predicts your period and fertile window — even irregular cycles — and keeps entries on your device. No account needed.

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 tracking, no servers of ours. Your cycle data stays on your device unless you explicitly use Apple Health or export/share a copy yourself. • Tracking works completely offline — no connection needed. • Calm, beautiful design with a cycle ring, calendar, and insights. • Honest predictions, even for irregular cycles. • Backups are encrypted when you choose a passphrase — 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.