What color is #331DC3?

#331DC3 is a medium, vivid indigo. In RGB it is rgb(51, 29, 195), and in HSL hsl(248, 74%, 44%).

Is #331DC3 accessible as text?

On white, #331DC3 has a contrast ratio of 9.98:1 (passes WCAG AA for body text); on black it is 2.10:1 (fails). For text placed on #331DC3, use white for the best readability.

What is the closest Tailwind color to #331DC3?

The nearest Tailwind CSS token is indigo-800 (#372AAC).

What colors go well with #331DC3?

#331DC3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #ADC31D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #331DC3 below.

Is #331DC3 good for buttons?

#331DC3 works well for buttons and highlights, but use white text on #331DC3 — black text only reaches 2.10:1, below the 4.5:1 needed for normal-size labels.

Is #331DC3 the same as CSS mediumblue?

No — #331DC3 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#331DC3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #331DC3

Not just a swatch — here's how #331DC3 works with other colors. Named schemes with #331DC3 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #331DC3 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #4D54E0

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 #331DC3 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 #331DC3 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 #331DC3 Secondary #626DA0 Support #9D9088 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 #331DC3 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.

Build a working theme in the generator →

Color Lab

How #331DC3 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 24/100

Low

Firm and assertive — carries weight and contrast.

Depth 65/100

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 11/100

Very low

Clean and current — no dusty, aged cast.

Luxury 56/100

Moderate

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

Brand distinctiveness 90/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 55/100

Moderate

Workable accent with care around contrast.

Surface fit 14/100

Very low

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

Print safety 62/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #331DC3

For UI

For branding

For interior

For fashion

People also use #331DC3 with

True Blue Dark Violet Peridot 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 10.0:1. Use

Subtle surface Use #D7D3F2 for cards and hover fills. Tint 80

Avoid beside #6B1DC3 — 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 #331DC3 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: #331DC3;
  --color-base-rgb: 51 29 195;
  --color-base-oklch: oklch(40.7% 0.233 274.5);
  --color-50: #F3F1FE;
  --color-100: #DFDBFB;
  --color-200: #C0B8F4;
  --color-300: #9588E7;
  --color-400: #6C5CD6;
  --color-500: #4B39BC;
  --color-600: #3F338F;
  --color-700: #312A65;
  --color-800: #231F42;
  --color-900: #171529;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  medium-blue: {
    50: '#F3F1FE',
    100: '#DFDBFB',
    200: '#C0B8F4',
    300: '#9588E7',
    400: '#6C5CD6',
    500: '#4B39BC',
    600: '#3F338F',
    700: '#312A65',
    800: '#231F42',
    900: '#171529',
  },
}

$base: #331DC3;
$base-ink: #FFFFFF;
$base-50: #F3F1FE;
$base-100: #DFDBFB;
$base-200: #C0B8F4;
$base-300: #9588E7;
$base-400: #6C5CD6;
$base-500: #4B39BC;
$base-600: #3F338F;
$base-700: #312A65;
$base-800: #231F42;
$base-900: #171529;
$base-hover: #29179C;
$base-subtle: #C2BCEC;

{
    "color": {
        "base": {
            "value": "#331DC3",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F1FE",
                "type": "color"
            },
            "100": {
                "value": "#DFDBFB",
                "type": "color"
            },
            "200": {
                "value": "#C0B8F4",
                "type": "color"
            },
            "300": {
                "value": "#9588E7",
                "type": "color"
            },
            "400": {
                "value": "#6C5CD6",
                "type": "color"
            },
            "500": {
                "value": "#4B39BC",
                "type": "color"
            },
            "600": {
                "value": "#3F338F",
                "type": "color"
            },
            "700": {
                "value": "#312A65",
                "type": "color"
            },
            "800": {
                "value": "#231F42",
                "type": "color"
            },
            "900": {
                "value": "#171529",
                "type": "color"
            }
        }
    }
}

Palettes built on #331DC3

Color Lab

Pairs with #331DC3

UI roles & guardrails

In real applications

Scales

Every model

Export