D-day Counter Widget is a free lifestyle app developed by PIONE STUDIO for Android. This app is designed to help users remember and keep track of important dates and events. Whether it's your anniversary, birthday, or any other special day, this app ensures that you never miss an important event again.

The app is very easy to use. Once you add an event, the remaining days until the event are automatically calculated and displayed. You can add repeating events as well, and the app will calculate the remaining days according to the repeat period. The app also allows you to see the list of events at any time, so you can keep track of all your important dates in one place.

Overall, D-day Counter Widget is a simple yet useful app for anyone who wants to keep track of important dates and events. It's perfect for people who are forgetful or who have busy schedules. With this app, you can rest assured that you will never miss an important day again.