iOS finally got a comprehensive redesign of an interface that hadn't changed much since the iPhone launch in 2007.
iOS 7.1 was released on March 10, with some new features such as upgrades to Siri, a new auto HDR mode for iPhone 5S, and several smaller interface tweaks. This gallery is mostly focused on the changes since iOS 7, but I've added several new slides at the beginning to show some of the bigger changes in 7.1, along with side-by-side comparisons of minor interface tweaks.
To start off, a feature that was hidden in iOS 7 has been moved front and center in iOS 7.1. Now, when you open the Calendar app in month view, you can touch a button at the top to see your daily list of appointments, meetings, and birthdays without having to navigate to a different screen. It was one of the features people were most up in arms about after iOS 7 came out, so it's nice to see it's back in iOS 7.1.