"Do It Today"
Today is a habit tracker that allows you to completely personalize your experience. You choose that habits that you want to start, and the app will help you achieve them through actionable steps, motivation, charts, and reinforcement.
The best part is that this app does sync with a lot of other health related apps, including the preinstalled Apple healthy life apps. There is so much customization available as well, down the smallest details on the charts that you keep. Milestones are a great way to work toward your goals, and the app even helps you break things down into smaller steps. Privacy is another benefit, with a passcode available in the premium features.
This app will only work as hard as you do. Some of the best features are only available on premium as well.