iOvulate Calculator is a simple and nice ovulation calendar. This program can help you avoid a pregnancy or conceive a child by marking the days you should avoid or have unprotected sex. The application can also mark which are the best days to have sex to conceive a boy or a girl, but this option is not available in the trial version. The program also marks menses, ovulation days, fertile days, and today of different colors, so you can easily recognize them on the calendar.
The first thing you have to do is to enter the day of your last period, average cycle length, and luteal phase length, and then press "Calculate". From the Preferences menu, you will also be able to customize the average menstrual cycle length and number of pre-ovulation and post-ovulation days. Unfortunately, the program doesn't include reminders or alerts, so you will have to check the program daily. iOvulate Calculator is very easy to use and has a nice user interface.
In short, if you are looking for a simple ovulation calendar either to conceive a baby or avoid one, iOvulate Calculator can be a perfect choice for you.