The main difference between Indigo and Mauve is brightness and saturation: both are purple shades, but Mauve is lighter. Indigo (#4B0082) has an HSL of 275°, 100%, 25%, whereas Mauve (#E0B0FF) sits at 276°, 100%, 85%.
Indigo (#4B0082) is a dark, vivid purple with a warm-leaning undertone — it feels rich, serious, substantial and bright, energetic, eye-catching.
Mauve (#E0B0FF) is a very light, vivid purple with a warm-leaning undertone — it feels pale, delicate, gentle 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.