The Ovulation Calculator helps you track your menstrual cycle and identify fertile windows simply and securely. Enter your last menstrual period (LMP) date and get automatic ovulation predictions, a color-coded visual calendar, and a history of entries.

Main features:

* Automatic calculation of your fertile window and likely ovulation date.
* Visual calendar with intuitive colors.
* Quick taps to log your period.
* History and predictions based on your cycle pattern.
* Data stored locally by default (no sharing without consent).

Ideal for those who want to monitor their fertility in a practical and informative way.