Pixel4u: Unicorn Coloring Game is an innovative color-by-number application designed for iPhone users, allowing for a unique social coloring experience. Users can import their own images, including selfies, and share them with friends who can then color them in. The app also features a Pixel Art Editor for creating and editing pixel art, enhancing the overall creative potential. With easy-to-follow numbered pixels, users can quickly fill in colors and even create time-lapse videos of their coloring process to share on social media.

The app offers a variety of features including a daily free coloring page, an iMessage app for sending secret messages through coloring pages, and a magic tool for correcting mistakes. It caters to users of all ages, making it a relaxing and enjoyable activity. A premium subscription is available for users who wish to unlock additional features, such as unlimited imports and ad removal, enhancing the overall experience.