tumblinas.

“What is this?
Mon.thly.Info is a simple tool to help you keep track of your menstrual cycles.

How does it work?
Each time you start your period, add the date to your Mon.thly account, and it will use your history to predict the next time your cycle will start. This provides you with a record of your menstrual cycles, which can be an important addition to your medical history. If you want, Mon.thly will also email you a customized reminder before or on your next estimated start date.”