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Color Theory for Developers

Understand RGB, HSL, and hex colors — build palettes and explore contrast with interactive pickers.

Web Development v1.0.0 54 uses
Step 1 of 4

Step 1: RGB & Hex

Every color on screen is made by mixing Red, Green, and Blue light. Each channel ranges from 0 (none) to 255 (full intensity).

Hex notation encodes the same RGB values as a 6-digit hexadecimal string: #RRGGBB. For example, rgb(255, 0, 0) is #FF0000 (pure red).

#80C850 rgb(128, 200, 80)

About This Lab

Color is fundamental to UI design. In this lab, you'll learn the three main color models developers use (RGB, HSL, Hex), understand color relationships like complementary and analogous colors, and check contrast ratios for accessibility. Every concept includes interactive tools you can experiment with.

How It Works

  1. 1 Read each step's explanation of color concepts
  2. 2 Use the interactive color pickers and sliders
  3. 3 Experiment with palette generation
  4. 4 Check contrast ratios for accessibility
  5. 5 Complete the quiz to test your knowledge
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