Boy or Girl is a free Android application designed to predict the gender of an unborn child using the ancient Chinese gender prediction chart. This method, believed to have originated over 700 years ago, relies on the mother’s age at conception and the conception date, which is calculated according to the Chinese lunar calendar. The app simplifies the often complex conversion from the Gregorian calendar to the lunar calendar, providing quick and easy results with just a few inputs.

The application features an automatic lunar calendar calculation for enhanced accuracy and is known for its straightforward, user-friendly interface. While the app offers a fun way to engage with traditional gender prediction, it is important to note that the results are for entertainment purposes only and do not replace medical or scientific insights. Users can enjoy the experience of predicting their future baby's gender, whether for planning or curiosity.