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.
Ratings & Reviews
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.
Version 1.5.0
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
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
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.