The iPad is a natural task-tracking tool, and with dozens of apps released every year for just this reason, there are plenty of options for those that want to use it as such. While iDidIt is a very stripped-down version of some other task list and to-do list apps on the App Store, it is a fine looking and functioning app that will work well for anyone that needs only the basics.
The core functionality of iDidIt is limited, but it is immediately intuitive regarding what you should be doing, and for a free app, that is exactly what you should expect. When you open the app, there are three menus: a list of tasks, a favorites menu, and a categories listing. Tap the "+" button to add a new task to the list and you can enter a name, category, and duration for the task. If you set a duration of more than one day for your tasks, you can mark it complete each day to fill up a progress bar on that task. Each task can also be marked as a favorite. This is the limit of the features included in iDidIt, so despite its effective design, it is a fairly limited app in terms of functionality.
If you need a to-do list that provides more features than iOS's built-in Reminders tool but not nearly as much as the pricey productivity apps on the App Store, iDidIt is a good in-between option. While not robust enough for most active mobile workers, it offers plenty for the casual to-do list user.