Menstral is free application that can tracks women’s menstrual cycles and indicates the fertile days. It runs on any mobile phone.
Menstral also shows the list of all the periods you entered (start date and length in days). This list can be useful for your visit to your doctor, or to give you a global view of your past cycle lengths.
You can costumize Menstral’s look by choosing between two color sets, Light (default) and Dark (shown in this image). It’s also possible to configure the start day of the week, choosing between Monday (European style) and Sunday (US style).