What color is #331C8B?

#331C8B is a dark indigo. In RGB it is rgb(51, 28, 139), and in HSL hsl(252, 66%, 33%).

Is #331C8B accessible as text?

On white, #331C8B has a contrast ratio of 12.50:1 (passes WCAG AA for body text); on black it is 1.68:1 (fails). For text placed on #331C8B, use white for the best readability.

What is the closest Tailwind color to #331C8B?

The nearest Tailwind CSS token is indigo-900 (#312C85).

What colors go well with #331C8B?

#331C8B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #758C1D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #331C8B below.

Is #331C8B good for buttons?

#331C8B works well for buttons and highlights, but use white text on #331C8B — black text only reaches 1.68:1, below the 4.5:1 needed for normal-size labels.

Is #331C8B the same as CSS indigo?

No — #331C8B is not the CSS named color indigo, but indigo (#4B0082) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#331C8B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #331C8B

Not just a swatch — here's how #331C8B works with other colors. Named schemes with #331C8B in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #331C8B Anchor #141210 Accent #DB9758 Secondary #272833 Surface #F3ECE3

Indigo carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors

Color #331C8B Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DA Accent #260048

Indigo adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Indigo.

Coastal Morning Lead · 5 colors

Lead #331C8B Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

Indigo opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Vintage Leather Lead · 5 colors

Lead #331C8B Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582238

Indigo plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #331C8B Secondary #595A7F Support #9D9088 Ink #18140F

Indigo is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Indigo carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #331C8B actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 19/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 25/100

Low

Firm and assertive — carries weight and contrast.

Depth 69/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 26/100

Low

A faint retro warmth without tipping into sepia.

Luxury 66/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 65/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 53/100

Moderate

Workable accent with care around contrast.

Surface fit 18/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #331C8B

For UI

For branding

For interior

For fashion

People also use #331C8B with

Sapphire Blue Eminence Olive Drab Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 12.5:1. Use

Subtle surface Use #D3CDED for cards and hover fills. Tint 80

Avoid beside #581D8C — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #331C8B at work across the surfaces designers actually ship.

Website / UI

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #331C8B;
  --color-base-rgb: 51 28 139;
  --color-base-oklch: oklch(34.3% 0.169 282.3);
  --color-50: #F4F2FD;
  --color-100: #E2DCF9;
  --color-200: #C6BBF1;
  --color-300: #9E8DE2;
  --color-400: #7862D0;
  --color-500: #5840B5;
  --color-600: #48388A;
  --color-700: #372D62;
  --color-800: #272140;
  --color-900: #191628;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  indigo: {
    50: '#F4F2FD',
    100: '#E2DCF9',
    200: '#C6BBF1',
    300: '#9E8DE2',
    400: '#7862D0',
    500: '#5840B5',
    600: '#48388A',
    700: '#372D62',
    800: '#272140',
    900: '#191628',
  },
}

$base: #331C8B;
$base-ink: #FFFFFF;
$base-50: #F4F2FD;
$base-100: #E2DCF9;
$base-200: #C6BBF1;
$base-300: #9E8DE2;
$base-400: #7862D0;
$base-500: #5840B5;
$base-600: #48388A;
$base-700: #372D62;
$base-800: #272140;
$base-900: #191628;
$base-hover: #291770;
$base-subtle: #BCB2E5;

{
    "color": {
        "base": {
            "value": "#331C8B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F2FD",
                "type": "color"
            },
            "100": {
                "value": "#E2DCF9",
                "type": "color"
            },
            "200": {
                "value": "#C6BBF1",
                "type": "color"
            },
            "300": {
                "value": "#9E8DE2",
                "type": "color"
            },
            "400": {
                "value": "#7862D0",
                "type": "color"
            },
            "500": {
                "value": "#5840B5",
                "type": "color"
            },
            "600": {
                "value": "#48388A",
                "type": "color"
            },
            "700": {
                "value": "#372D62",
                "type": "color"
            },
            "800": {
                "value": "#272140",
                "type": "color"
            },
            "900": {
                "value": "#191628",
                "type": "color"
            }
        }
    }
}

Palettes built on #331C8B

Color Lab

Pairs with #331C8B

UI roles & guardrails

In real applications

Scales

Every model

Export