Lich Am Duong is a free lunar calendar app developed by Thanh Hung, available on Android. The app provides a comprehensive range of features that include a lunar calendar, the ability to switch between the lunar and solar calendar, an overview of good and bad days, the option to save important dates, and a reminder function.

The lunar calendar is accurate and easy to navigate, with detailed information on each lunar day. The app allows users to easily convert dates between the lunar and solar calendars, making it a useful tool for those who need to work with both.

In addition, Lich Am Duong provides a list of good and bad days based on the lunar calendar, which is useful for planning important events. Users can also save important dates, such as birthdays and anniversaries, and set reminders to ensure they don't forget.

Overall, Lich Am Duong is a well-designed and user-friendly app that provides a comprehensive range of features for those looking for a lunar calendar tool.