What color is #304FC0?

#304FC0 is a medium blue. In RGB it is rgb(48, 79, 192), and in HSL hsl(227, 60%, 47%).

Is #304FC0 accessible as text?

On white, #304FC0 has a contrast ratio of 6.99:1 (passes WCAG AA for body text); on black it is 3.01:1 (fails). For text placed on #304FC0, use white for the best readability.

What is the closest Tailwind color to #304FC0?

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

What colors go well with #304FC0?

#304FC0 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C0A130. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #304FC0 below.

Is #304FC0 good for buttons?

#304FC0 works well for buttons and highlights, but use white text on #304FC0 — black text only reaches 3.01:1, below the 4.5:1 needed for normal-size labels.

Is #304FC0 the same as CSS royalblue?

No — #304FC0 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#304FC0 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #304FC0

Not just a swatch — here's how #304FC0 works with other colors. Named schemes with #304FC0 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #304FC0 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 #304FC0 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5477DF

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 #304FC0 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 #304FC0 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 #304FC0 Secondary #7484AC 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.

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Color Lab

How #304FC0 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 10/100

Cool

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 55/100

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 55/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 49/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 89/100

Very high

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

Surface fit 9/100

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 #304FC0

For UI

For branding

For interior

For fashion

People also use #304FC0 with

Picton Blue Grape Brass Gainsboro Gunmetal Gray

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

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 7.0:1. Use

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

Avoid beside #4130C0 — 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 #304FC0 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: #304FC0;
  --color-base-rgb: 48 79 192;
  --color-base-oklch: oklch(47.5% 0.181 267.3);
  --color-50: #F2F4FC;
  --color-100: #DEE3F8;
  --color-200: #BEC8EF;
  --color-300: #91A2DE;
  --color-400: #677DCB;
  --color-500: #465CAF;
  --color-600: #3C4C86;
  --color-700: #2F3A60;
  --color-800: #22283F;
  --color-900: #161A27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F2F4FC',
    100: '#DEE3F8',
    200: '#BEC8EF',
    300: '#91A2DE',
    400: '#677DCB',
    500: '#465CAF',
    600: '#3C4C86',
    700: '#2F3A60',
    800: '#22283F',
    900: '#161A27',
  },
}

$base: #304FC0;
$base-ink: #FFFFFF;
$base-50: #F2F4FC;
$base-100: #DEE3F8;
$base-200: #BEC8EF;
$base-300: #91A2DE;
$base-400: #677DCB;
$base-500: #465CAF;
$base-600: #3C4C86;
$base-700: #2F3A60;
$base-800: #22283F;
$base-900: #161A27;
$base-hover: #263F99;
$base-subtle: #C4CCE9;

{
    "color": {
        "base": {
            "value": "#304FC0",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F4FC",
                "type": "color"
            },
            "100": {
                "value": "#DEE3F8",
                "type": "color"
            },
            "200": {
                "value": "#BEC8EF",
                "type": "color"
            },
            "300": {
                "value": "#91A2DE",
                "type": "color"
            },
            "400": {
                "value": "#677DCB",
                "type": "color"
            },
            "500": {
                "value": "#465CAF",
                "type": "color"
            },
            "600": {
                "value": "#3C4C86",
                "type": "color"
            },
            "700": {
                "value": "#2F3A60",
                "type": "color"
            },
            "800": {
                "value": "#22283F",
                "type": "color"
            },
            "900": {
                "value": "#161A27",
                "type": "color"
            }
        }
    }
}

Palettes built on #304FC0

Color Lab

Pairs with #304FC0

UI roles & guardrails

In real applications

Scales

Every model

Export