The tracker has a clean interface and it's simple to set up habits. I've only experienced one glitch: sometimes when you're looking at the calendar view of a habit the heading won't show up. If I could improve the app I would make the habit description show up in the habit calendar page. Right now you have to click on the habit name to view the description. I would also make an option to include skip days so if you need to skip a habit it doesn't count against your streak progress.