Zen Color - Color By Number represents a specialized entry in the digital coloring application market, positioning itself as a mindfulness tool rather than merely entertainment. Developed by Oakever Games, the application transforms the traditional color-by-number concept into a meditative experience through carefully curated content and atmospheric design elements that emphasize tranquility and mental relaxation. The application's core functionality revolves around an extensive library of Zen-inspired artwork organized into thematic categories. Users interact with detailed illustrations through a precise color-fill system where numbered sections correspond to a palette selection. The interface includes zoom capabilities for intricate details, auto-fill options for larger areas, and progress saving features. Additional tools include customizable brush sizes, color palette management, and background music integration specifically designed to enhance the meditative experience. User experience demonstrates thoughtful design choices with intuitive navigation and minimal cognitive load. The interface employs soft color schemes, clean typography, and fluid animations that align with Zen principles. Real-world usage patterns show peak engagement during evening relaxation periods and short breaks throughout the day, with average session durations ranging from 15-45 minutes. The application maintains performance stability across various Android devices with minimal battery consumption during extended use. User feedback trends indicate strong satisfaction with content variety and relaxation value, though some feature requests emerge consistently. Theresa Alley's August 2025 review praises the 'beautiful pictures and variety,' while lnspotts1's July 2025 feedback requests enhanced search functionality for thematic content. Multiple reviews from July-August 2025 mention appreciation for developer responsiveness to issues, particularly regarding audio adjustments mentioned by Martha Salazar in her updated review. The application excels in providing genuine stress relief through its curated content and atmospheric design, though limitations include some users' desire for more control over musical selections and offline capabilities. Ideal use cases involve daily mindfulness practice, creative breaks during work hours, or as a digital alternative to traditional coloring books for adults seeking structured relaxation.