Ebb — Private Cycle Tracker

Ebb is a period and cycle tracker built on one promise: your data never leaves your phone.

No account. No sign-up. No ads. No analytics. No cloud. Ebb doesn't even have permission to use the internet — so it can't send your information anywhere, whatever any policy says. Everything you log is encrypted on your device and stays there.

WHY EBB IS DIFFERENT

• Truly offline — there is no server, and no internet permission in the app.
• Encrypted at rest — your database is protected with SQLCipher (AES-256) and the Android Keystore.
• App lock — secure the app with a PIN, your fingerprint, or face.
• Decoy PIN — a second PIN opens a genuinely empty version of the app, in case someone forces you to unlock it.
• Honest predictions — Ebb shows a date range, not a fake-confident single day, and tells you when your cycle is too variable to predict. No app actually knows the exact day.
• Encrypted backup you control — export an encrypted .ebb file anywhere you like, protected by a passphrase only you know. Losing your phone doesn't mean losing your history.

TRACK WHAT MATTERS TO YOU

• Flow, symptoms (with severity), mood, intimacy, basal body temperature, and private notes
• Custom symptoms — track anything, not just a fixed list
• A clean calendar and an honest cycle ring on the home screen
• Insights: average cycle and period length, symptom and mood trends, cycle-length history
• A history report by week, month, or year

FOR EVERY STAGE

• Choose your intent: general health, trying to conceive, avoiding pregnancy, or health-only (no fertility framing)
• Pregnancy, postpartum, and perimenopause modes that adapt the whole app
• Fertility signals: BBT and cervical-mucus tracking, folded honestly into predictions

HELPFUL TOOLS (all on-device, nothing stored unless you choose)

• Contraction timer with a shareable log
• Kick counter
• Due-date and date forecast calculators
• Doctor-visit summary you can share
• BMI calculator, cycle-regularity report, BBT ovulation check

REMINDERS THAT RESPECT YOU

• Period, fertile-window, and daily-log reminders at the time you set
• Exact-time medication reminders (pill, ring, patch, injection) with snooze
• Notifications hide their details on the lock screen

IMPORT YOUR HISTORY

• Restore from an encrypted Ebb backup
• Import your period history from Health Connect (read-only — Ebb never writes back)

A NOTE ON HONESTY

Ebb is not a contraceptive and not medical advice. Predictions are estimates and never imply contraceptive reliability. Ebb describes your cycle; it doesn't diagnose it.

Your body. Your data. Your phone. That's the whole idea.