The Big Day: Wedding Planning is a free Android app developed by The Big Day Weddings. It is designed to help brides plan their weddings with ease. With this app, you can create and personalize multiple event countdowns, manage your to-do lists, spending, guests, and timetables all in one place.

This app has a simple and clear interface that makes it easy to use. Upon entering your planned wedding date and name, you can start your personal wedding countdown. You can choose colors, fonts, and background images to make the countdown your own. The app also has a built-in sharing feature that lets you share a beautiful snapshot of your countdown with your friends and family.

Additionally, the app has a check list to track your to-dos, with built-in categories like budget, venue, styling, or decoration. You can complete pre-defined tasks or create your own, and highlight all the things which are important for you. You can also move and re-order tasks to fit your needs and prioritization. The app also has a guest list feature that lets you curate your personal guest list, tag your guests by groups and tables, and keep track of the RSVP state of all your guests.