Well-Thought Out!
I love how you can customize the way habits are completed. On top of the usual goal count, there's "duration" and "selection from a menu" modes. I do wish there was a widget for the app, to show habit progress on the home screen, but I don't know if the developer is still active. The best thing about this app by far is that it doesn't have IAPs though, unlike most of the habit trackers featured on the App Store.