What color is #331ECC?

#331ECC is a medium, vivid indigo. In RGB it is rgb(51, 30, 204), and in HSL hsl(247, 74%, 46%).

Is #331ECC accessible as text?

On white, #331ECC has a contrast ratio of 9.55:1 (passes WCAG AA for body text); on black it is 2.20:1 (fails). For text placed on #331ECC, use white for the best readability.

What is the closest Tailwind color to #331ECC?

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

What colors go well with #331ECC?

#331ECC pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B8CC1E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #331ECC below.

Is #331ECC good for buttons?

#331ECC works well for buttons and highlights, but use white text on #331ECC — black text only reaches 2.20:1, below the 4.5:1 needed for normal-size labels.

Is #331ECC the same as CSS mediumblue?

No — #331ECC is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

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

Palettes built on #331ECC

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

Tech Product Signal · 5 colors

Signal #331ECC Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #4D56E9

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

Coastal Morning Lead · 5 colors

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

Medium Blue 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 #331ECC Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Medium Blue 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 #331ECC Secondary #6470A6 Support #9D8F88 Ink #18140F

Medium 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 Medium Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #331ECC Secondary #E86A72 Accent #F6924F Anchor #573B58 Surface #F7E7D7

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

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Color Lab

How #331ECC 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 14/100

Cool

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

Softness 23/100

Low

Firm and assertive — carries weight and contrast.

Depth 64/100

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 9/100

Very low

Clean and current — no dusty, aged cast.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 93/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 53/100

Moderate

Workable accent with care around contrast.

Surface fit 13/100

Very low

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

Print safety 60/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #331ECC

For UI

For branding

For interior

For fashion

People also use #331ECC with

Signal Blue Dark Violet Yellow Green 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 9.6:1. Use

Subtle surface Use #D8D5F2 for cards and hover fills. Tint 80

Avoid beside #6D1ECC — 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 #331ECC 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: #331ECC;
  --color-base-rgb: 51 30 204;
  --color-base-oklch: oklch(41.8% 0.242 273.7);
  --color-50: #F3F1FE;
  --color-100: #DEDBFB;
  --color-200: #BFB8F4;
  --color-300: #9388E7;
  --color-400: #6A5CD6;
  --color-500: #4839BC;
  --color-600: #3E338F;
  --color-700: #302A65;
  --color-800: #231F42;
  --color-900: #171529;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  medium-blue: {
    50: '#F3F1FE',
    100: '#DEDBFB',
    200: '#BFB8F4',
    300: '#9388E7',
    400: '#6A5CD6',
    500: '#4839BC',
    600: '#3E338F',
    700: '#302A65',
    800: '#231F42',
    900: '#171529',
  },
}

$base: #331ECC;
$base-ink: #FFFFFF;
$base-50: #F3F1FE;
$base-100: #DEDBFB;
$base-200: #BFB8F4;
$base-300: #9388E7;
$base-400: #6A5CD6;
$base-500: #4839BC;
$base-600: #3E338F;
$base-700: #302A65;
$base-800: #231F42;
$base-900: #171529;
$base-hover: #2918A3;
$base-subtle: #C4BEED;

{
    "color": {
        "base": {
            "value": "#331ECC",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F1FE",
                "type": "color"
            },
            "100": {
                "value": "#DEDBFB",
                "type": "color"
            },
            "200": {
                "value": "#BFB8F4",
                "type": "color"
            },
            "300": {
                "value": "#9388E7",
                "type": "color"
            },
            "400": {
                "value": "#6A5CD6",
                "type": "color"
            },
            "500": {
                "value": "#4839BC",
                "type": "color"
            },
            "600": {
                "value": "#3E338F",
                "type": "color"
            },
            "700": {
                "value": "#302A65",
                "type": "color"
            },
            "800": {
                "value": "#231F42",
                "type": "color"
            },
            "900": {
                "value": "#171529",
                "type": "color"
            }
        }
    }
}

Palettes built on #331ECC

Color Lab

Pairs with #331ECC

UI roles & guardrails

In real applications

Scales

Every model

Export