Ebb
Ebb app icon
Ebb — Period & Cycle Tracker

The cycle tracker that's honest about irregular cycles.

Predicts your period as a realistic range with a confidence level — not a fake-precise date.

Download on the App Store
Free tier forever · Your data stays on your phone
Ebb Today screen — the next period predicted as a date range with a confidence level
Next period
82% confidence
Jul 10 Jul 14 – 18 Jul 24

Built for irregular & PCOS cycles

Honest ranges instead of guesses — and the app tells you how sure it is, so you can plan around reality.

Your data stays on your phone

Nothing uploaded, nothing sold, no account required. Delete the app and your data is gone — that's it.

Free tier, forever

No price tricks

A free tier that's actually useful, full price shown before you start, and one-tap cancel. No weekly-trial traps.

Private by design. Educational, never diagnostic.