CSS named color
Indigo #4B0082
Indigo is dark vivid violet. Below: every color format, WCAG contrast against black and white, its tints, shades and tones, and the harmonies that pair with it.
Color values
Contrast & accessibility
WCAG contrast ratio of Indigo used as a foreground on white and black backgrounds.
On white
On black
Tints, shades & tones
Systematic variations of Indigo — click any swatch to copy its hex.
Simulated colour vision
How Indigo reads under the four common colour-vision deficiencies, using the standard Machado (2009) matrices at full severity. A simulation, not a measurement of any one person's vision; the point is whether this colour still does its job when hue drops out.
#4B0082Tailwind-style ramp
Eleven steps from 50 to 950 with the hue and saturation of Indigo held and only lightness stepped. Computed, not curated: the 500 step sits closest to the source, which is where Tailwind puts a brand colour.
Color harmonies
Palettes built from Indigo by rotating its hue. Each swatch links to its closest named color.
Complementary
Analogous
Split-complementary
Use Indigo in your stack
Tailwind (arbitrary value)
Works for any property: text-[#4b0082], border-[#4b0082].
CSS custom property
Reference it anywhere with var(--color).
Build a full theme
Turn Indigo into a complete shadcn/ui palette — light & dark, contrast-checked, one-command install.
Extract a theme →