Everyday is an app designed to make it easy to snap a photo every day to chronicle how your look changes over time. Made popular by various bloggers and other photography types, the concept is you snap a picture of yourself everyday, then after a significant amount of time (6 months? One year?), you can show a movie of gradual changes to your appearance.
With the Everyday app, most of the work is done for you. You can set up reminders so that you get a push notification to take today's picture. After you take your first picture the app helps you set up alignment indicators so you know you'll always have your daily shot lined up perfectly. After taking a shot a day for a significant amount of time, small appearance changes (like facial hair or hair length) are cool to look at as each day goes by in the movie. You also have the ability to set the movie speed so, for example, you could show a longer stretch of time using a faster frame rate so the movie doesn't go on too long.
Overall, Everyday is an app with just one purpose--taking a daily shot to make an interesting photo/movie project. But with the addition of reminders, onscreen alignment indicators, and other helpful tools, the app makes it really easy to take one shot a day to make a neat project that will pay off later.