Color Master - Color by Number positions itself as a digital art therapy application, providing users with an extensive library of coloring templates across various categories. With a 4.7-star rating on Android, the app has established itself in the crowded coloring app market by combining creative tools with mindfulness elements. The developer, Coloring Game Studio@RabiGame, regularly updates content while maintaining a freemium model supported by advertising. The application's core functionality revolves around its massive collection of over 10,000 dynamic artworks, ranging from intricate mandalas to pop culture references. The smart color tools feature one-tap filling technology, custom palette creation, and adaptive color recommendations that streamline the coloring process. These technical features demonstrate thoughtful implementation, particularly the color recommendation system that suggests harmonious color combinations based on user selection patterns and completed sections. User experience presents both polished and problematic elements. The interface employs an intuitive grid-based navigation system with clearly categorized artwork sections. Real-world usage patterns show most users engage in short sessions of 5-15 minutes, utilizing the app during breaks or as a winding-down activity. However, the experience is frequently interrupted by advertisement placements that appear between coloring sessions and upon completing artworks. The storage management system has drawn criticism for unexpectedly large file sizes that can reach 9GB, potentially causing device storage issues for users with limited capacity. User feedback reveals consistent patterns across recent reviews. Ruby The Guinea Pig (May 12, 2025) documented a significant improvement after reinstalling, noting previous issues with excessive advertisements had been resolved. Storage concerns emerge prominently, with The Poet (April 28, 2025) reporting the app unexpectedly consuming 9GB of device storage. Anissa Almeida (June 12, 2025) praised the artwork quality while criticizing the requirement to complete four paintings for daily rewards compared to competitors' single-painting requirements. These reviews indicate ongoing development challenges regarding resource management and user experience optimization. The application demonstrates strengths in content variety and coloring technology implementation, making it suitable for users seeking diverse artistic options. Significant limitations include aggressive advertisement implementation and storage management issues that may frustrate users with older devices or limited data plans. Ideal use cases involve intermediate Android users with sufficient device storage who value content variety over seamless user experience and can tolerate frequent advertisement interruptions in exchange for free access to premium-quality coloring templates.