What color is #303151?

#303151 is a dark, muted blue-violet. In RGB it is rgb(48, 49, 81), and in HSL hsl(238, 26%, 25%).

Is #303151 accessible as text?

On white, #303151 has a contrast ratio of 12.47:1 (passes WCAG AA for body text); on black it is 1.68:1 (fails). For text placed on #303151, use white for the best readability.

What is the closest Tailwind color to #303151?

The nearest Tailwind CSS token is mauve-700 (#463947).

What colors go well with #303151?

#303151 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #504F2F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #303151 below.

Is #303151 good for buttons?

#303151 works well for buttons and highlights, but use white text on #303151 — black text only reaches 1.68:1, below the 4.5:1 needed for normal-size labels.

Is #303151 the same as CSS midnightblue?

No — #303151 is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#303151 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #303151

Not just a swatch — here's how #303151 works with other colors. Named schemes with #303151 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #303151 Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

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

Nordic Calm Accent · 5 colors

Accent #303151 Secondary #AEB4B8 Surface #F1F2F0 Support #7E92A7 Anchor #2E3236

Gunmetal Gray keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Vintage Leather Lead · 5 colors

Lead #303151 Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582238

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

Luxury Packaging Feature · 5 colors

Feature #303151 Anchor #141210 Accent #DB9758 Secondary #272833 Surface #F3ECE3

Gunmetal Gray 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #303151 Secondary #585965 Support #9D9088 Ink #18140F

Gunmetal Gray 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 Gunmetal Gray carrying the quiet middle.

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Color Lab

How #303151 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 40/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

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 37/100

Low

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 22/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 37/100

Low

Workable accent with care around contrast.

Surface fit 47/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 92/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #303151

For UI

For branding

For interior

For fashion

People also use #303151 with

Iron Gray Onyx Army Green Gainsboro Gunmetal Gray

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 #D2D2E0 for cards and hover fills. Tint 80

Avoid beside #392F50 — 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 #303151 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: #303151;
  --color-base-rgb: 48 49 81;
  --color-base-oklch: oklch(32.8% 0.056 281.5);
  --color-50: #F5F5FA;
  --color-100: #E5E5F0;
  --color-200: #CCCCE1;
  --color-300: #A7A8C8;
  --color-400: #8385AF;
  --color-500: #646591;
  --color-600: #515271;
  --color-700: #3D3E52;
  --color-800: #2A2B37;
  --color-900: #1B1B22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F5F5FA',
    100: '#E5E5F0',
    200: '#CCCCE1',
    300: '#A7A8C8',
    400: '#8385AF',
    500: '#646591',
    600: '#515271',
    700: '#3D3E52',
    800: '#2A2B37',
    900: '#1B1B22',
  },
}

$base: #303151;
$base-ink: #FFFFFF;
$base-50: #F5F5FA;
$base-100: #E5E5F0;
$base-200: #CCCCE1;
$base-300: #A7A8C8;
$base-400: #8385AF;
$base-500: #646591;
$base-600: #515271;
$base-700: #3D3E52;
$base-800: #2A2B37;
$base-900: #1B1B22;
$base-hover: #262740;
$base-subtle: #BABBD1;

{
    "color": {
        "base": {
            "value": "#303151",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E5E5F0",
                "type": "color"
            },
            "200": {
                "value": "#CCCCE1",
                "type": "color"
            },
            "300": {
                "value": "#A7A8C8",
                "type": "color"
            },
            "400": {
                "value": "#8385AF",
                "type": "color"
            },
            "500": {
                "value": "#646591",
                "type": "color"
            },
            "600": {
                "value": "#515271",
                "type": "color"
            },
            "700": {
                "value": "#3D3E52",
                "type": "color"
            },
            "800": {
                "value": "#2A2B37",
                "type": "color"
            },
            "900": {
                "value": "#1B1B22",
                "type": "color"
            }
        }
    }
}