7 Weeks is an Android-based habit and goal tracker app that helps you develop new habits or break bad ones. It is based on Charles Duhigg's bestselling book, "The Power of Habit," and the X effect method of completing goals. The app creates an uncomplicated strategy of completing one day of your habit/goal at a time.

The app has a beautiful material design interface, custom alarms, and flexible weekly goals. You can customize each habit with multiple customization options. Scientists believe that the sweet spot for developing a habit is around 7 weeks, and once you have completed 49 days straight with little failure, you can be sure you'll have developed a positive habit, broken a bad habit, or completed a goal.

7 Weeks Gold, the upgraded version of the app, offers more features such as the ability to track more than two habits at a time, two fully functional home screen widgets, and unlimited custom reminders with custom repeats, time, and messages.

Overall, 7 Weeks is an excellent app to get you on track to making your habits and goals. It is easy to use and has a simple yet effective strategy for developing and breaking habits.