Birthday Countdown is a free Android application developed by Vladimir_Belov that helps you keep track of all the important dates and events in your life. This lifestyle app allows you to create a list of memorable dates and events from your address book, calendar, or local files. You can customize the event widgets in the form of scalable photo cards and lists with individual settings for each widget.

One of the best features of Birthday Countdown is the customizable notifications for upcoming events. You will never forget an important date again! Additionally, there is a quiz feature that tests your knowledge of the events of your contacts: when they were born, how old they are, and what month their birthday is in.

This app supports various event types, including birthdays, wedding anniversaries, other events, custom events, and round days for events. It also supports calendar events, Facebook events, and events and birthdays from local files. Birthday Countdown works with Google, Skype, Xiaomi, VK, Samsung, Asus, MS Exchange (via Gmail), IBM Verse (IBM Notes Traveler), and Huawei.

Overall, Birthday Countdown is a great app for anyone who wants to keep track of important dates and events. With its various customizable features and quiz feature, it's a fun and useful tool that you won't want to miss.