iOS: To-do lists are ideal for keeping track of what you need to do, but sometimes it's good to see what you've already done. Recur! is an app that keeps track of the tasks you've completed, reminds you when you need to do them again, and tracks how many days it's been since you completed your first one.
Recur! fits somewhere between a to-do tracker and a goal tracker. You can track anything you want, from exercise to practising the mandolin, and you'll see a counter every time you complete the task. It's very simple compared to other goal tracking apps, but the simplicity makes it easy to use. Recur! is made by the developer of CARROT, so it can work with CARROT to keep track of your completed tasks. Unfortunately, it doesn't come with the same snarky attitude as CARROT.
Recur! ($0.99) [iTunes App Store]