The main difference between Blue and Navy is brightness and saturation: both are purple shades, but Blue is lighter. Blue (#0000FF) and Navy (#000080) are similar colors often confused. They differ in brightness, saturation, and undertone, making each better suited for different design contexts.
Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.
Blue is more saturated (100% HSL vs 100%) so it reads as bolder and more memorable at logo scale, while Navy can feel washed out when printed small.
Navy hits a 16.01:1 WCAG contrast against white — safer for text-heavy interfaces — where Blue only reaches 8.59:1 and risks failing AA at small body sizes.
Blue is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Navy leans cooler and is better suited to autumn/winter layering.
Blue is the more muted of the two (100% saturation) and sits more calmly on large wall surfaces, while Navy's higher chroma can overwhelm a room when used beyond accent pieces.
Blue (#0000FF) is a medium, vivid purple with a cool undertone — it feels balanced, versatile and bright, energetic, eye-catching.
Navy (#000080) is a dark, vivid purple 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.