What color is #331AEA?

#331AEA is a medium, vivid indigo. In RGB it is rgb(51, 26, 234), and in HSL hsl(247, 83%, 51%).

Is #331AEA accessible as text?

On white, #331AEA has a contrast ratio of 8.48:1 (passes WCAG AA for body text); on black it is 2.48:1 (fails). For text placed on #331AEA, use white for the best readability.

What is the closest Tailwind color to #331AEA?

The nearest Tailwind CSS token is indigo-700 (#432DD7).

What colors go well with #331AEA?

#331AEA pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D2EA1A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #331AEA below.

Is #331AEA good for buttons?

#331AEA works well for buttons and highlights, but use white text on #331AEA — black text only reaches 2.48:1, below the 4.5:1 needed for normal-size labels.

Is #331AEA the same as CSS blue?

No — #331AEA is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

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

Palettes built on #331AEA

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

Tech Product Signal · 5 colors

Signal #331AEA Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #4C5BFF

Ultramarine is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Ultramarine.

Coastal Morning Lead · 5 colors

Lead #331AEA Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Berry & Cream Lead · 5 colors

Lead #331AEA Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Ultramarine sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #331AEA Secondary #697AB7 Support #9D8F88 Ink #18140F

Ultramarine 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 Ultramarine carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #331AEA Secondary #E86A73 Accent #F6924F Anchor #573B58 Surface #F7E7D7

Ultramarine glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

Build a working theme in the generator →

Color Lab

How #331AEA 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 13/100

Cool

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

Softness 22/100

Low

Firm and assertive — carries weight and contrast.

Depth 62/100

High

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 0/100

Very low

Clean and current — no dusty, aged cast.

Luxury 49/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 100/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 43/100

Moderate

Workable accent with care around contrast.

Surface fit 11/100

Very low

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

Print safety 54/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #331AEA

For UI

For branding

For interior

For fashion

People also use #331AEA with

Dodger Blue Electric Purple Pear 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 8.5:1. Use

Subtle surface Use #DBD7F5 for cards and hover fills. Tint 80

Avoid beside #781AEA — 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 #331AEA 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: #331AEA;
  --color-base-rgb: 51 26 234;
  --color-base-oklch: oklch(45.1% 0.276 271.6);
  --color-50: #F2F0FE;
  --color-100: #DDD9FD;
  --color-200: #BCB4F8;
  --color-300: #8F82ED;
  --color-400: #6454DE;
  --color-500: #4231C3;
  --color-600: #392D95;
  --color-700: #2E2669;
  --color-800: #211C44;
  --color-900: #16132A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultramarine: {
    50: '#F2F0FE',
    100: '#DDD9FD',
    200: '#BCB4F8',
    300: '#8F82ED',
    400: '#6454DE',
    500: '#4231C3',
    600: '#392D95',
    700: '#2E2669',
    800: '#211C44',
    900: '#16132A',
  },
}

$base: #331AEA;
$base-ink: #FFFFFF;
$base-50: #F2F0FE;
$base-100: #DDD9FD;
$base-200: #BCB4F8;
$base-300: #8F82ED;
$base-400: #6454DE;
$base-500: #4231C3;
$base-600: #392D95;
$base-700: #2E2669;
$base-800: #211C44;
$base-900: #16132A;
$base-hover: #2612BE;
$base-subtle: #C7C2F1;

{
    "color": {
        "base": {
            "value": "#331AEA",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F0FE",
                "type": "color"
            },
            "100": {
                "value": "#DDD9FD",
                "type": "color"
            },
            "200": {
                "value": "#BCB4F8",
                "type": "color"
            },
            "300": {
                "value": "#8F82ED",
                "type": "color"
            },
            "400": {
                "value": "#6454DE",
                "type": "color"
            },
            "500": {
                "value": "#4231C3",
                "type": "color"
            },
            "600": {
                "value": "#392D95",
                "type": "color"
            },
            "700": {
                "value": "#2E2669",
                "type": "color"
            },
            "800": {
                "value": "#211C44",
                "type": "color"
            },
            "900": {
                "value": "#16132A",
                "type": "color"
            }
        }
    }
}

Palettes built on #331AEA

Color Lab

Pairs with #331AEA

UI roles & guardrails

In real applications

Scales

Every model

Export