The Guest by The Knot is a free photo-sharing app that allows event attendees to share photos and videos in real-time. The app automatically shares photos as guests take them, eliminating the need for uploading and tagging. It is a perfect app for weddings, receptions, and other events, as it helps the newlyweds or event hosts to get all the photos and videos taken by their guests.

With The Guest, guests can use their normal iPhone camera to take photos and videos, and share them instantly with everyone who is part of the event. The app provides full-resolution photos and full-length videos that can be downloaded by everyone. Additionally, The Guest creates a web album that can be accessed by everyone, and live web slideshows can be displayed on any screen with a simple web link.

The app also features a private, real-time map view that allows guests to see where they went during the event. Guests who couldn't attend the event in person can also follow along in real-time via The Guest. The app is easy to use and free to download from the App Store.

Overall, The Guest is a great app for anyone who wants to capture and share memories of an event. It eliminates the need for separate camera apps and uploading photos, making it a hassle-free way to share photos and videos with everyone who attended the event.