Niah: Private Period Tracker

Niah is a private period and ovulation tracker with no account. Your cycle data stays on your iPhone.

Switching from another tracker? Import past periods from Apple Health or a CSV file, or tell Niah when your last period started, and see your next period predicted from day one.

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.
• Lock Niah with a PIN in Settings › Privacy lock. An optional decoy PIN opens an empty Niah, and your real data stays hidden until you enter your real PIN.
• New iPhone? Settings › Your data › Move to a new device creates an encrypted transfer file and a one-time code, and Niah checks that every logged day arrived.
• 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 cycle insights are built in.

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, honest, and calm.