Butterfly is a light, free application designed to output the incoming menstruation and ovulation days with infertile and fertile periods in both a calendarview and listview. The utility pops up with the prognosis of the present day.

This menstruation and ovulation calendar runs in the "Fertile days" modus. The fertile days are marked with a green color. If you select the "menstruation mode", then the menses days are marked with a red color.

Butterfly is available as portable and can be installed on a usb drive....Read more about Butterfly