Niio: Period Tracker

Cycle & Ovulation Predictions

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Track your period, predict your fertile window, and understand your body — with gentle reminders and private insights made just for you. Niio is a simple, private way to track your period, understand your body, and know what to expect — without the clutter. Log your period, symptoms, mood, energy, and sleep in seconds. Niio turns that into clear predictions and gentle reminders, so you're never caught off guard. WHAT NIIO TRACKS • Period dates and flow intensity • Fertile window and estimated ovulation • Symptoms — cramps, headaches, bloating, fatigue, and more • Mood and energy levels • Sleep quality • Private notes for anything else you want to remember PREDICTIONS YOU CAN TRUST Niio's predictions get smarter the more you log — starting from your own cycle history, not generic averages. Confidence labels are always shown, so you know whether an estimate is based on real data or still a first guess. GENTLE REMINDERS Get quiet, private notifications before your period and fertile window begin — never anything that gives away what they're for. INSIGHTS THAT MAKE SENSE OF YOUR DATA See your most common symptoms, mood patterns, and cycle trends over time, translated into plain-language tips. PRIVATE BY DESIGN Niio doesn't require an account. Your cycle data stays on your device. You can also lock the app with Face ID or your fingerprint for an extra layer of privacy. NIIO PREMIUM Upgrade for: • No ads, anywhere in the app • Your full cycle history (free shows the last 2 months) • PMS forecasts based on your own premenstrual weeks • Symptom, mood, and sleep correlations • Cycle regularity and 3/6/12-month trends • Health reports for any month, exportable as PDF • Full data export as CSV Niio is here to help you understand your cycle — and yourself — a little better, one day at a time. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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The developer, QUANG NINH BUI, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location
    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • QUANG NINH BUI
Size
  • 33 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
9+
  • 9+
  • Learn More
  • Contains
    Advertising
    Health or Wellness Topics
In-App Purchases
Yes
  • Niio: Period Tracker $12.99
  • Niio: Period Tracker $2.99
  • Learn More
Copyright
  • © 2026 Niio Preiod Tracker
  • Developer Website
  • Privacy Policy

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