Wunderlist is a fantastic example of streamlined, intuitive design being used to provide a powerful, feature-rich experience for productivity junkies. While other GTD and list-keeping apps can cost a small fortune for iOS, Wunderlist is free. Despite that, it operates much like a paid app and works seamlessly on your device, Mac, or PC.
Wunderlist offers a number of features, but its core attraction is list creation. When it opens, you will need to register for an account or connect via Facebook. From there, you can start creating lists and on those lists you can create tasks. The pull-out side menu is easy to read and easier to manipulate, allowing you to move tasks up and down the list without issue. Your inbox allows you to jot down quick notes on the fly and then categorize them and add due dates later in true GTD fashion. You can also add people to tasks, e-mail them to yourself for a reminder, or move them between lists. The interface is easy to navigate with quick swipes between panels that slide out of the side of the screen, and you can create subtasks or notes for any one task.
In short, Wunderlist is one of the best note-taking and GTD apps on the iPhone, made more incredible by the free price tag. If you are looking for something more robust and easier to track than e-mail or a spreadsheet, download Wunderlist today. It is one of the few must-have apps for your phone if you need to be on top of tasks.