What color is #304B69?

#304B69 is a dark blue. In RGB it is rgb(48, 75, 105), and in HSL hsl(212, 37%, 30%).

Is #304B69 accessible as text?

On white, #304B69 has a contrast ratio of 8.99:1 (passes WCAG AA for body text); on black it is 2.34:1 (fails). For text placed on #304B69, use white for the best readability.

What is the closest Tailwind color to #304B69?

The nearest Tailwind CSS token is cyan-900 (#104E64).

What colors go well with #304B69?

#304B69 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #694E30. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #304B69 below.

Is #304B69 good for buttons?

#304B69 works well for buttons and highlights, but use white text on #304B69 — black text only reaches 2.34:1, below the 4.5:1 needed for normal-size labels.

Is #304B69 the same as CSS darkslategray?

No — #304B69 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#304B69 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #304B69

Not just a swatch — here's how #304B69 works with other colors. Named schemes with #304B69 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #304B69 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Charcoal 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 #304B69 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

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

Tech Product Signal · 5 colors

Signal #304B69 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #536D89

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

Vintage Leather Lead · 5 colors

Lead #304B69 Secondary #7F4537 Surface #E1DDC0 Accent #375245 Anchor #57233B

Charcoal 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 #F6F4EF Accent #304B69 Secondary #67717D Support #959386 Ink #16140F

Charcoal 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 Charcoal carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #304B69 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 33/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 57/100

Moderate

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 41/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 62/100

High

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

Brand distinctiveness 23/100

Low

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

UI accent fit 59/100

Moderate

Workable accent with care around contrast.

Surface fit 40/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 87/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #304B69

For UI

For branding

For interior

For fashion

People also use #304B69 with

Dark Cyan Yale Blue Coffee Gainsboro Charcoal

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 9.0:1. Use

Subtle surface Use #D2DBE5 for cards and hover fills. Tint 80

Avoid beside #303869 — 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 #304B69 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: #304B69;
  --color-base-rgb: 48 75 105;
  --color-base-oklch: oklch(40.5% 0.061 251.9);
  --color-50: #F4F7FA;
  --color-100: #E3EAF3;
  --color-200: #C7D5E5;
  --color-300: #A0B6CF;
  --color-400: #7A97B8;
  --color-500: #5A789B;
  --color-600: #4A5F78;
  --color-700: #384656;
  --color-800: #283039;
  --color-900: #1A1E24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F4F7FA',
    100: '#E3EAF3',
    200: '#C7D5E5',
    300: '#A0B6CF',
    400: '#7A97B8',
    500: '#5A789B',
    600: '#4A5F78',
    700: '#384656',
    800: '#283039',
    900: '#1A1E24',
  },
}

$base: #304B69;
$base-ink: #FFFFFF;
$base-50: #F4F7FA;
$base-100: #E3EAF3;
$base-200: #C7D5E5;
$base-300: #A0B6CF;
$base-400: #7A97B8;
$base-500: #5A789B;
$base-600: #4A5F78;
$base-700: #384656;
$base-800: #283039;
$base-900: #1A1E24;
$base-hover: #273C54;
$base-subtle: #BAC8D9;

{
    "color": {
        "base": {
            "value": "#304B69",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F7FA",
                "type": "color"
            },
            "100": {
                "value": "#E3EAF3",
                "type": "color"
            },
            "200": {
                "value": "#C7D5E5",
                "type": "color"
            },
            "300": {
                "value": "#A0B6CF",
                "type": "color"
            },
            "400": {
                "value": "#7A97B8",
                "type": "color"
            },
            "500": {
                "value": "#5A789B",
                "type": "color"
            },
            "600": {
                "value": "#4A5F78",
                "type": "color"
            },
            "700": {
                "value": "#384656",
                "type": "color"
            },
            "800": {
                "value": "#283039",
                "type": "color"
            },
            "900": {
                "value": "#1A1E24",
                "type": "color"
            }
        }
    }
}

Palettes built on #304B69

Color Lab

Pairs with #304B69

UI roles & guardrails

In real applications

Scales

Every model

Export