Indigo Blue Color
Indigo Blue is a purple color with hex code #3A18B1. This page covers its meaning, all color values, harmonies, colors that go with indigo blue, shades, tints, similar colors, CSS examples, FAQs, and WCAG contrast ratios.
Indigo Blue Color Values
What Does Indigo Blue Mean?
Indigo Blue belongs to the purple family of colors. Purple dye once cost more than gold, and the royal association never really wore off. The family blends red's warmth with blue's calm, which is an odd, appealing combination. Brands pick purple partly because their competitors don't. Indigo Blue sits at a mid-lightness, which keeps it readable on both white and black without much fuss.
In the ISCC-NBS color naming system, Indigo Blue is classified as a blue (nearest centroid: vivid purplish blue, #30267A).
Color Harmonies
Complementary
Analogous
Triadic
Colors That Go With Indigo Blue
Indigo Blue and #8EAF18 are complements, parked opposite each other on the wheel. Together they hit maximum contrast, so a rough 70/30 split keeps the pairing from shouting.
Analogous neighbors — #1843AF and #8418AF, which sit beside indigo blue on the wheel. Pairings like this feel calm and settled, which suits backgrounds and gradients.
For an energetic three-color palette, pair indigo blue with triadic partners #AF3918 and #18AF39. All three sit evenly spaced around the wheel, so the scheme stays lively without clashing.
Build and test these combinations in our Color Wheel Tool or check text readability with the Contrast Checker.
Tints and Shades
Tints (lighter)
Shades (darker)
Similar Colors
- Cobalt Blue —
#030AA7(Delta E 7) - Royal Blue —
#0504AA(Delta E 8) - Ultramarine —
#2000B1(Delta E 10) - Blurple —
#5539CC(Delta E 12) - DarkBlue —
#00008B(Delta E 13)
CSS Examples
.text { color: #3A18B1; }
.background { background-color: #3A18B1; }
.border { border: 2px solid #3A18B1; }
.shadow { box-shadow: 0 4px 6px #3A18B140; }WCAG Contrast
Frequently Asked Questions
What is the hex code for indigo blue?
Indigo Blue has the hex code #3A18B1. In RGB notation it is rgb(58, 24, 177), in HSL it is hsl(253, 76%, 39%), and its OKLCH value is 0.387, 0.214, 279.7.
What does the color indigo blue mean?
Purple-family colors like indigo blue carry distinct psychological associations. Indigo Blue belongs to the purple family of colors. Purple dye once cost more than gold, and the royal association never really wore off. The family blends red's warmth with blue's calm, which is an odd, appealing combination. Brands pick purple partly because their competitors don't. Indigo Blue sits at a mid-lightness, which keeps it readable on both white and black without much fuss.
What colors go with indigo blue?
Indigo Blue has three easy routes: its complement #8EAF18 for punch, its neighbors #1843AF and #8418AF for something calmer, or triadic partners #AF3918 and #18AF39 when you want energy.
Is indigo blue a standard web color?
No — Indigo Blue is not a CSS keyword. Use its hex value #3A18B1 or any RGB/HSL equivalent in your stylesheets.
How do I make indigo blue lighter or darker?
To lighten indigo blue, add white to create tints; to darken it, add black to create shades. The tints and shades table above shows five computed steps of each, from #DBD2F9 (lightest tint) to #0A041F (darkest shade).
About Indigo Blue
Indigo Blue is classified as a Blue in the ISCC-NBS color naming system, within the Purple hue family. It has The color is recognized by XKCD, meodai.
Use our Color Converter to convert #3A18B1 to any other color format, or explore the Color Wheel to find harmonious color combinations.