What color is #331E99?

#331E99 is a dark indigo. In RGB it is rgb(51, 30, 153), and in HSL hsl(250, 67%, 36%).

Is #331E99 accessible as text?

On white, #331E99 has a contrast ratio of 11.76:1 (passes WCAG AA for body text); on black it is 1.79:1 (fails). For text placed on #331E99, use white for the best readability.

What is the closest Tailwind color to #331E99?

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

What colors go well with #331E99?

#331E99 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #85991E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #331E99 below.

Is #331E99 good for buttons?

#331E99 works well for buttons and highlights, but use white text on #331E99 — black text only reaches 1.79:1, below the 4.5:1 needed for normal-size labels.

Is #331E99 the same as CSS indigo?

No — #331E99 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.

#331E99 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #331E99

Not just a swatch — here's how #331E99 works with other colors. Named schemes with #331E99 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #331E99 Anchor #141210 Accent #DC9758 Secondary #272833 Surface #F3ECE3

Egyptian Blue 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 #331E99 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #290153

Egyptian Blue 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 Egyptian Blue.

Coastal Morning Lead · 5 colors

Lead #331E99 Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #22344A

Egyptian Blue 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 #331E99 Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582238

Egyptian Blue 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 #331E99 Secondary #5C5F88 Support #9D9088 Ink #18140F

Egyptian Blue 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 Egyptian Blue carrying the quiet middle.

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Color Lab

How #331E99 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 18/100

Cool

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

Softness 25/100

Low

Firm and assertive — carries weight and contrast.

Depth 68/100

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 23/100

Low

Clean and current — no dusty, aged cast.

Luxury 64/100

High

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

Brand distinctiveness 71/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 56/100

Moderate

Workable accent with care around contrast.

Surface fit 17/100

Very low

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

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #331E99

For UI

For branding

For interior

For fashion

People also use #331E99 with

Denim Blue Grape 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 11.8:1. Use

Subtle surface Use #D4CFEE for cards and hover fills. Tint 80

Avoid beside #5C1E99 — 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 #331E99 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: #331E99;
  --color-base-rgb: 51 30 153;
  --color-base-oklch: oklch(36.0% 0.184 279.6);
  --color-50: #F4F2FD;
  --color-100: #E1DCF9;
  --color-200: #C4BBF1;
  --color-300: #9B8CE3;
  --color-400: #7462D0;
  --color-500: #533FB5;
  --color-600: #45378B;
  --color-700: #352C62;
  --color-800: #262041;
  --color-900: #191628;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  egyptian-blue: {
    50: '#F4F2FD',
    100: '#E1DCF9',
    200: '#C4BBF1',
    300: '#9B8CE3',
    400: '#7462D0',
    500: '#533FB5',
    600: '#45378B',
    700: '#352C62',
    800: '#262041',
    900: '#191628',
  },
}

$base: #331E99;
$base-ink: #FFFFFF;
$base-50: #F4F2FD;
$base-100: #E1DCF9;
$base-200: #C4BBF1;
$base-300: #9B8CE3;
$base-400: #7462D0;
$base-500: #533FB5;
$base-600: #45378B;
$base-700: #352C62;
$base-800: #262041;
$base-900: #191628;
$base-hover: #29187B;
$base-subtle: #BDB5E7;

{
    "color": {
        "base": {
            "value": "#331E99",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F2FD",
                "type": "color"
            },
            "100": {
                "value": "#E1DCF9",
                "type": "color"
            },
            "200": {
                "value": "#C4BBF1",
                "type": "color"
            },
            "300": {
                "value": "#9B8CE3",
                "type": "color"
            },
            "400": {
                "value": "#7462D0",
                "type": "color"
            },
            "500": {
                "value": "#533FB5",
                "type": "color"
            },
            "600": {
                "value": "#45378B",
                "type": "color"
            },
            "700": {
                "value": "#352C62",
                "type": "color"
            },
            "800": {
                "value": "#262041",
                "type": "color"
            },
            "900": {
                "value": "#191628",
                "type": "color"
            }
        }
    }
}

Palettes built on #331E99

Color Lab

Pairs with #331E99

UI roles & guardrails

In real applications

Scales

Every model

Export