RAINBOW - Number Coloring is a lifestyle app designed to help users alleviate stress and anxiety through engaging coloring activities. With a simple premise, users fill in pixels according to numbers to reveal beautiful images, making it accessible and enjoyable for all ages. The app boasts a variety of pictures to choose from, ensuring that users always have fresh content to explore. It not only promotes relaxation but also aids in developing fine motor skills, creativity, and color recognition.

The app offers several features including the ability to share completed artwork on social media platforms like Instagram and Facebook, or save creations to your camera roll. Users can also import their own photos to create personalized coloring experiences. While the app is free to download, it includes subscription options for unlimited access to all features and removes ads, enhancing the overall user experience.