Preeo
Period & cycle tracker
Preeo predicts your next period and fertile window, and adapts to your stage of life: regular cycles, PCOS, trying to conceive, pregnancy, postpartum and perimenopause. Log flow, symptoms and moods in a few taps, and see patterns you can share with your doctor.
Predictions, quick logging and clear charts in one calm app.
Preeo predicts your next period and fertile window, and the predictions adjust as you log. It learns from up to your last 12 cycles. For PCOS and irregular cycles it shows a date range instead of a single guess, and when you log BBT or LH tests it can learn your luteal phase. Every date is an estimate. How period predictions work.
Track flow, discharge, notes and 35+ symptoms across body, mood and energy. Log by voice by saying how you feel, and set reminders for your period, fertile window, pill and daily check-in.
See your calendar, cycle ring and phase timeline, plus charts for cycle length, symptoms and mood. Ask the optional AI assistant questions about your cycle in plain language, sync with Apple Health on iPhone, and earn medallions as you build a logging habit.
Pick the mode that fits your life right now. Pregnancy, Trying to Conceive, Postpartum and Birth Control modes walk you through a quick setup first.
Tell Preeo where you are: typical cycles, PCOS, trying to conceive, pregnancy, postpartum, perimenopause and more.
Tap to log flow, symptoms and moods, or log by voice. Reminders help you keep going.
Your calendar, cycle ring and charts update as you log, with predictions that adjust to your cycles.
With Preeo Premium, create a doctor-ready PDF report of your cycle and symptom history.
Choose a health mode, check your cycle day, and log how you feel.
Here is what Preeo does with your logs. For full details, including how the optional AI assistant and ads work, read the Privacy Policy and Data Safety summary.
On iPhone, your logs are saved on your phone and backed up to your account. Symptoms, moods, notes and intimacy logs are encrypted on your phone before they're backed up.
In the Privacy Vault you can pause cloud sync, see network activity, and delete your account. Lock the app with Face ID.
We never sell your health data or use it for advertising. The free version shows ads; Preeo Premium is ad-free.
Sourced guides that open with a direct answer.
About 21 to 38 days for adults, and up to 45 days in the first years after periods start.
By averaging your recent cycles. Here's how accurate that is, and why it isn't birth control.
What counts as irregular, what to log, and why a date range beats a single date.
Preeo is a cycle and period tracker for iPhone and Android. It predicts your next period and fertile window and adapts to your stage of life: regular cycles, PCOS, trying to conceive, pregnancy, postpartum and perimenopause.
Preeo is free to download. Preeo Premium is an optional auto-renewing subscription, monthly or yearly, that adds unlimited AI questions, deeper insights, doctor reports and an ad-free experience. You can manage or cancel it anytime in your App Store or Google Play account settings.
Yes. For PCOS and irregular cycles, Preeo shows predictions as a date range rather than a single guess, and the predictions adjust as you log.
No. Period, fertile-window and ovulation dates in Preeo are estimates. Preeo is not a method of birth control and must not be used to prevent pregnancy.
On iPhone, your logs are saved on your phone and backed up to your account. Symptoms, moods, notes and intimacy logs are encrypted on your phone before they're backed up, and you can pause cloud sync in the Privacy Vault. We never sell your health data or use it for advertising.
Yes. You can delete your account in the Privacy Vault in the app, or follow the steps on the Preeo Delete Account page.
Yes. Preeo syncs with Apple Health on iPhone.
No. Preeo is for wellness and information only. It does not diagnose or treat any condition. Always talk to your doctor about your health.
Free to download. Preeo Premium is an optional auto-renewing subscription, monthly or yearly, for unlimited AI questions, deeper insights, doctor reports and an ad-free experience.
App Store: Preeo: Cycle & Period Tracker
Google Play: Preeo
Help with the app, billing and your account.
Important: Preeo is for wellness and information only. It is not a medical device and does not diagnose or treat any condition. Period, fertile-window and ovulation dates are estimates. Preeo is not a method of birth control and must not be used to prevent pregnancy. Always talk to your doctor about your health.