Ondi: Private Period Tracker

Cycle, Ovulation & Smart Ring

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

A private period tracker that keeps your data on your phone and nowhere else. Private period tracking, with daily logs and cycle history on your device. No account required. Ondi learns your unique cycle and gives you personalised insights that get smarter with every log. WHAT'S FREE — ALWAYS • Period tracking with automatic cycle detection • Daily logging: flow, mood, energy, sleep, symptoms • Cycle predictions that improve over time • Calendar with cycle history • Cycle irregularity alerts UNLOCK EVERYTHING (one-time purchase) • Fertility tracking: temperature, cervical mucus, ovulation tests • Contraception side effect matching • Headache and migraine pattern detection • PMS prediction and sleep analysis • Exercise guidance tailored to your cycle phase • Trying to Conceive mode with timing insights • Pregnancy mode: week-by-week guidance and due date • Postpartum recovery tracking • Data export for doctor appointments PRIVACY FIRST Your logs are stored on your device. Ondi does not operate a server for your health records or use tracking analytics. Apple Health access is optional, and you choose when to export or share a report. Copies you export and data stored in Apple Health are managed separately. EVERY STAGE OF YOUR JOURNEY From first periods to menopause, Ondi adapts. Perimenopause pattern detection, postpartum period return guidance, and breastfeeding-aware insights — all explained in plain language. WORKS WITH APPLE WATCH Reads wrist temperature and heart rate data from Apple Health to enhance predictions without manual tracking. Ondi is not a medical device and should not be used as contraception. Predictions are estimates. Always consult a healthcare provider for medical decisions.

  • 5.0
    out of 5
    2 Ratings

A small tune-up behind the scenes, plus one fix. • Bug: in Japanese and Chinese, the ring under your cycle day counted "28 items" instead of a 28-day cycle. Fix: it now reads as a 28-day cycle, like it should. Still no account, no cloud, and nothing leaves your phone.

The developer, Blue Flame Games, 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 Collected

    The developer does not collect any data from this app.

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

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

    Provider
    Alexandru Ghita
    Size
    11 MB
    Category
    Health & Fitness
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    Languages
    English and 6 more
    • English, French, German, Hindi, Japanese, Simplified Chinese, Spanish
    Age Rating
    13+
    • 13+
    • Infrequent
      Medical Treatment Information

      Contains
      Health or Wellness Topics
    In-App Purchases
    Yes
    Copyright
    © 2026 BFG