Pocket Rainbow Toolkit

Turn color into something you can calculate, compare, test, and understand. Pocket Rainbow Toolkit brings together practical color tools, visual exercises, and concise learning materials for designers, creators, students, and anyone interested in working with color. Use the Color Formula Calculator to mix colors with precise values, calculate averages, create intermediate shades, lighten or darken colors, adjust opacity, and convert between HEX, RGB, HSL, and LAB. Build palettes and review color separation, contrast, grayscale distinction, and dark mode compatibility with the Palette Stress Test. Compare similar shades with the Color Difference Calculator using Delta E, hue, lightness, saturation, and perceptual difference measurements. Develop color recognition skills by recreating target shades with RGB or HSL controls and reviewing the accuracy of each result. Explore concise articles and quizzes covering RGB, LAB, Delta E, contrast, grayscale behavior, display technology, and color perception. Save palettes, revisit previous results, and build a clearer understanding of color through practical use.