Users begin by answering a questionnaire to teach the
Ovuline says its users get pregnant in an average of 56 days. Compare this to the freestyle method, which Ovuline says takes an average of four to six months.
While basic web app functionality is free, you can access more advanced features and make use of the iPhone app for a one-time $50 fee.
Head over to Ovuline's site to learn more.
It's not the only app out there that helps with this task. Pink Pad, by Alt12 Apps, is another.