D-Day is a free Android app developed by parkho79 that allows users to keep track of important events and countdown to them. It is a simple and effective tool for anyone who wants to remember important dates and plan for upcoming events.

The app offers a number of useful features, including the ability to add, edit, and delete D-Days, as well as the option to add images to each event. Users can also view their events by month, making it easy to keep track of what's coming up. Additionally, the app comes with a simple widget that allows users to display their D-Days on their home screen, providing quick and easy access to important event information.

Overall, D-Day is a great choice for anyone looking for a simple and straightforward countdown app. Its ease of use and useful features make it a must-have for anyone who wants to stay organized and on top of their schedule.