On this device

Period.

Next period Add two periods to see a rough estimate
No periods recorded yet Estimate only

Period Estimated window
Your history

Recorded periods

0
○
Nothing logged yet Add the first day of a period. That is all we record.
Dates only

Log period
Private by design

Backup & privacy

Stored on this device

Your dates stay in this web app unless you choose an encrypted export or cloud backup.

Cycle length

Optionally set your own cycle length. It overrides the median-based estimate; if your history differs, both values are shown.

Reminders

Optional Web Push sends one reminder before the next estimate. Due reminders are checked daily at 11:00 AM IST. The server receives the reminder date, but never your recorded periods.

Recovery passphrase

Use at least 10 characters. It is never stored or sent, and cannot be recovered.

Encrypted file

Keep a private recovery copy in Files, iCloud Drive, or another location you trust.

Optional cloud backup

Uploads only encrypted text. Local preview has no backup server.