What color is #306CE4?

#306CE4 is a medium, vivid blue. In RGB it is rgb(48, 108, 228), and in HSL hsl(220, 77%, 54%).

Is #306CE4 accessible as text?

On white, #306CE4 has a contrast ratio of 4.78:1 (passes WCAG AA for body text); on black it is 4.39:1 (fails). For text placed on #306CE4, use white for the best readability.

What is the closest Tailwind color to #306CE4?

The nearest Tailwind CSS token is blue-600 (#155DFC).

What colors go well with #306CE4?

#306CE4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E4A82F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #306CE4 below.

Is #306CE4 good for buttons?

#306CE4 works well for buttons and highlights, but use white text on #306CE4 — black text only reaches 4.39:1, below the 4.5:1 needed for normal-size labels.

Is #306CE4 the same as CSS royalblue?

No — #306CE4 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#306CE4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #306CE4

Not just a swatch — here's how #306CE4 works with other colors. Named schemes with #306CE4 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #306CE4 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5B94FF

Royal 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 Royal Blue.

Coastal Morning Lead · 5 colors

Lead #306CE4 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Royal 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 #306CE4 Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Royal 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 #306CE4 Secondary #889FCA Support #9D8F88 Ink #18140F

Royal 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 Royal Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #306CE4 Secondary #E76A75 Accent #F79152 Anchor #573B58 Surface #EEEBD6

Royal 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 #306CE4 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 8/100

Cool

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

Softness 36/100

Low

Middle-weight — neither delicate nor heavy.

Depth 47/100

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 46/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 75/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 88/100

Very high

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

Surface fit 13/100

Very low

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

Print safety 63/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #306CE4

For UI

For branding

For interior

For fashion

People also use #306CE4 with

Medium Turquoise Han Purple Goldenrod Gainsboro Charcoal

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 4.8:1. Use

Subtle surface Use #DBE3F5 for cards and hover fills. Tint 80

Avoid beside #2F2FE4 — 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 #306CE4 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: #306CE4;
  --color-base-rgb: 48 108 228;
  --color-base-oklch: oklch(56.2% 0.193 262.2);
  --color-50: #F1F5FE;
  --color-100: #DAE5FB;
  --color-200: #B7CCF5;
  --color-300: #86A7E9;
  --color-400: #5984D9;
  --color-500: #3764BE;
  --color-600: #315191;
  --color-700: #283D66;
  --color-800: #1E2A43;
  --color-900: #141B29;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  royal-blue: {
    50: '#F1F5FE',
    100: '#DAE5FB',
    200: '#B7CCF5',
    300: '#86A7E9',
    400: '#5984D9',
    500: '#3764BE',
    600: '#315191',
    700: '#283D66',
    800: '#1E2A43',
    900: '#141B29',
  },
}

$base: #306CE4;
$base-ink: #FFFFFF;
$base-50: #F1F5FE;
$base-100: #DAE5FB;
$base-200: #B7CCF5;
$base-300: #86A7E9;
$base-400: #5984D9;
$base-500: #3764BE;
$base-600: #315191;
$base-700: #283D66;
$base-800: #1E2A43;
$base-900: #141B29;
$base-hover: #1952C3;
$base-subtle: #C7D5F0;

{
    "color": {
        "base": {
            "value": "#306CE4",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F5FE",
                "type": "color"
            },
            "100": {
                "value": "#DAE5FB",
                "type": "color"
            },
            "200": {
                "value": "#B7CCF5",
                "type": "color"
            },
            "300": {
                "value": "#86A7E9",
                "type": "color"
            },
            "400": {
                "value": "#5984D9",
                "type": "color"
            },
            "500": {
                "value": "#3764BE",
                "type": "color"
            },
            "600": {
                "value": "#315191",
                "type": "color"
            },
            "700": {
                "value": "#283D66",
                "type": "color"
            },
            "800": {
                "value": "#1E2A43",
                "type": "color"
            },
            "900": {
                "value": "#141B29",
                "type": "color"
            }
        }
    }
}