What color is #304ABE?

#304ABE is a medium blue. In RGB it is rgb(48, 74, 190), and in HSL hsl(229, 60%, 47%).

Is #304ABE accessible as text?

On white, #304ABE has a contrast ratio of 7.37:1 (passes WCAG AA for body text); on black it is 2.85:1 (fails). For text placed on #304ABE, use white for the best readability.

What is the closest Tailwind color to #304ABE?

The nearest Tailwind CSS token is blue-800 (#193CB8).

What colors go well with #304ABE?

#304ABE pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C0A530. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #304ABE below.

Is #304ABE good for buttons?

#304ABE works well for buttons and highlights, but use white text on #304ABE — black text only reaches 2.85:1, below the 4.5:1 needed for normal-size labels.

Is #304ABE the same as CSS darkslateblue?

No — #304ABE is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

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

Palettes built on #304ABE

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

Coastal Morning Lead · 5 colors

Lead #304ABE Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Tech Product Signal · 5 colors

Signal #304ABE Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5372DD

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

Vintage Leather Lead · 5 colors

Lead #304ABE Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #58223A

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

Berry & Cream Lead · 5 colors

Lead #304ABE Surface #F6E5D8 Anchor #5B2143 Accent #E5C2CA Secondary #322B2F

Cerulean 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 #304ABE Secondary #7180A9 Support #9D8F88 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #304ABE 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 11/100

Cool

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

Softness 31/100

Low

Firm and assertive — carries weight and contrast.

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 27/100

Low

A faint retro warmth without tipping into sepia.

Luxury 55/100

Moderate

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

Brand distinctiveness 50/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 86/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 10/100

Very low

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

Print safety 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #304ABE

For UI

For branding

For interior

For fashion

People also use #304ABE with

Picton Blue Grape Brass 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 7.4:1. Use

Subtle surface Use #D8DDF0 for cards and hover fills. Tint 80

Avoid beside #4630C0 — 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 #304ABE at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #304ABE;
  --color-base-rgb: 48 74 190;
  --color-base-oklch: oklch(46.4% 0.184 268.4);
  --color-50: #F2F4FC;
  --color-100: #DEE2F8;
  --color-200: #BEC7EF;
  --color-300: #919FDE;
  --color-400: #677ACB;
  --color-500: #4659AF;
  --color-600: #3C4986;
  --color-700: #2F3860;
  --color-800: #22273F;
  --color-900: #161927;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F2F4FC',
    100: '#DEE2F8',
    200: '#BEC7EF',
    300: '#919FDE',
    400: '#677ACB',
    500: '#4659AF',
    600: '#3C4986',
    700: '#2F3860',
    800: '#22273F',
    900: '#161927',
  },
}

$base: #304ABE;
$base-ink: #FFFFFF;
$base-50: #F2F4FC;
$base-100: #DEE2F8;
$base-200: #BEC7EF;
$base-300: #919FDE;
$base-400: #677ACB;
$base-500: #4659AF;
$base-600: #3C4986;
$base-700: #2F3860;
$base-800: #22273F;
$base-900: #161927;
$base-hover: #263B99;
$base-subtle: #C4CBE9;

{
    "color": {
        "base": {
            "value": "#304ABE",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F4FC",
                "type": "color"
            },
            "100": {
                "value": "#DEE2F8",
                "type": "color"
            },
            "200": {
                "value": "#BEC7EF",
                "type": "color"
            },
            "300": {
                "value": "#919FDE",
                "type": "color"
            },
            "400": {
                "value": "#677ACB",
                "type": "color"
            },
            "500": {
                "value": "#4659AF",
                "type": "color"
            },
            "600": {
                "value": "#3C4986",
                "type": "color"
            },
            "700": {
                "value": "#2F3860",
                "type": "color"
            },
            "800": {
                "value": "#22273F",
                "type": "color"
            },
            "900": {
                "value": "#161927",
                "type": "color"
            }
        }
    }
}

Palettes built on #304ABE

Color Lab

Pairs with #304ABE

UI roles & guardrails

In real applications

Scales

Every model

Export