Ebb: Period & Cycle Tracker

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Everyone
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Everyone
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About this app

Ebb learns the length of your cycles and shows the next period as a window. The width of that window is the honest part: it covers the days Ebb is actually unsure about, and it narrows as your history grows.

Your cycle data stays on your phone. You don't create an account, and Ebb sends nothing about your cycle anywhere. Periods, symptoms, moods, sleep and notes are stored on the device and never uploaded.

WHAT EBB DOES
- A cycle wheel on Today with the current phase, the estimated fertile window and the prediction window
- A five-second log for flow, symptoms, moods, sleep and a note
- Insights from your own data: average cycle and period length, and your last three cycles
- Reminders before your period, on the expected day, and for logging
- CSV export and import, always on an explicit tap
- App lock with a PIN or fingerprint, and a discreet mode with a neutral home screen icon and neutral reminder texts

EBB PRO
Everything above stays free, with no ads. Pro is a one-time purchase and adds:
- Predictions three cycles ahead
- Symptom patterns by phase
- Full history and the regularity trend
- PDF report and calendar export
- Extended reminders and custom symptoms

A NOTE ON ESTIMATES
Every date in Ebb is an estimate based on your own past cycles. Ebb is a tracker for your own records and is not meant for medical diagnosis or for avoiding pregnancy.

Questions and feedback: clearpointstudios@proton.me
Your next period as a window, give or take the days Ebb is unsure about.
Updated on
Oct 26, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Personal info, Financial info and 3 others
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

- Ebb in 15 languages, you can pick one in Profile
- Help and feedback: write to us and get the reply right in the app
- The PDF report now uses your app language and your phone's fonts