Strawberry Pal is a free menstrual calendar to keep track of and predict your menstrual cycle and fertility online. After you have entered a few dates when your period started (just click!), Strawberry Pal will be able to predict your future menstrual cycles and ovulation with increasing accuracy. If you save your period calendar using a password, you can import your prediction into other calendar tools such as Google Calendar, iCal or Outlook. Strawberry Pal also works great as a web app on your iPhone or Android phone!
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