Butterfly is a small application that helps women to keep detailed track of their ovulation and menstruation.
The program displays a small calendar with fertile days colored green, and days of your menstrual cycle colored red. That means you only need a quick glance to see what stage your body is at.
Butterfly can also predict (more or less accurately) when your period will arrive up to several months in advance, and you can even print a report to keep on hand.
Butterfly is a useful tool for any woman trying to keep track of her ovulation or menstrual cycle.