The main difference between Navy Blue and Cerulean is hue — Navy Blue is a cool blue, while Cerulean is a cool cyan. Navy Blue (#001F3F) has an HSL of 210°, 100%, 12%, whereas Cerulean (#007BA7) sits at 196°, 100%, 33%.
Navy Blue (#001F3F) is a very dark, vivid blue with a cool undertone — it feels deep, heavy, grounded and bright, energetic, eye-catching.
Cerulean (#007BA7) is a dark, vivid cyan with a cool undertone — it feels rich, serious, substantial and bright, energetic, eye-catching.
Text legibility depends on the contrast ratio between foreground and background. WCAG 2.1 AA requires at least 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Use these numbers to choose accessible combinations for your design.
Each color has a dedicated page with shades, tints, CSS name, pairings, and color psychology.