Been Together - Couple D-day is an Android application developed by Been Together Inc. that allows you to check how long you have been with your lover at a glance. The app also helps you celebrate your anniversary with your memories. With the number of days shown on the widget, you can check it without opening the app. The app is available for free on the Google Play Store but has in-app purchases.

The app's main screen calculates and shows the number of passed days from the anniversary. You can see the passed days from the anniversary on the widget, notification area, or lock screen. The app allows you to customize the main screen as your own by using photos and changing names. You can also customize the background of the main screen. The app notifies you by each 100 days from the anniversary, and you can have multiple anniversaries on the side-menu. You can share your screen on social media, too.