The Big Day: Wedding Planner by Marina Mazein is a wedding planning app for iPhone that is designed to help users manage their wedding planning needs in one place. With this app, you can create multiple event countdowns, track your wedding guests, manage your to-do lists, spending, and timelines, and keep all your supplier information in one place.

This app is perfect for anyone who wants to keep their wedding planning organized and stress-free. With a simple and clear interface, the app is easy to navigate, and it allows you to personalize your countdowns with your own photo. The app also offers a budget planner to help you keep track of your expenses, and a seating chart function to manage your guests. You can even schedule your wedding day with the timeline functionality and get notified about the remaining time until your wedding.

The Big Day: Wedding Planner also offers a collaborative planning feature, allowing you to invite your partner and friends to join in the planning process. Additionally, you can use the countdown widget on your home screen to keep track of your progress. One of the best things about this app is that it is completely ad-free.

Overall, The Big Day: Wedding Planner is a comprehensive and user-friendly app that is perfect for anyone who wants to stay organized and on top of their wedding planning.