App of the Week: Ladytimer Period and Ovulation Calendar
There are two approaches to getting pregnant: either get on top of the maths to pinpoint your fertile period, or take the "shock and awe" approach and practise baby-making on a daily basis. If you want to take the mathematical approach, then this iPhone app can help.

HK $23

There are two approaches to getting pregnant: either get on top of the maths to pinpoint your fertile period, or take the "shock and awe" approach and practise baby-making on a daily basis. If you want to take the mathematical approach, then this iPhone app can help.
Fifth download lucky, the app met two important criteria in that it had enough functionality to be useful, yet was easy to use. This contrasted to an earlier download, Fertility Friend, which offered endless stress-inducing options in an ugly, war tank-type interface.
Start by typing in your period cycle and length. If you don't know, the app promises to work it out for you. Next, enter your last period start and finish date, and you're off.
The app displays a calendar showing your expected ovulation date, which is estimated to be 12 to 16 days before your period starts. Your most fertile period is estimated to be the three days preceding ovulation.