Habit Rabbit: Task Tracker is a free iPhone app developed by Justin Patrick Silang under the Business & Productivity category. It's an app that helps you stick to good habits by motivating you with a fun and interactive experience.

The app features a virtual rabbit that becomes more colorful and clean the more you complete your habits. You can earn carrots to customize your rabbit and design its house. Habit Rabbit also has a leaderboard where you can view other people's rabbits and their progress.

Aside from tracking your habits, the app also gives you daily motivation quotes or productivity tips, asks you how you're feeling, and tracks your moods. It even gives recommendations on what habit to work on and cheers you on every time you complete a habit.

Overall, Habit Rabbit: Task Tracker is a fun and engaging way to track your habits and stay motivated. It's perfect for anyone who wants to improve their daily routine and form good habits.