What color is #0566BB?

#0566BB is a dark, vivid blue. In RGB it is rgb(5, 102, 187), and in HSL hsl(208, 95%, 38%).

Is #0566BB accessible as text?

On white, #0566BB has a contrast ratio of 5.79:1 (passes WCAG AA for body text); on black it is 3.62:1 (fails). For text placed on #0566BB, use white for the best readability.

What is the closest Tailwind color to #0566BB?

The nearest Tailwind CSS token is sky-700 (#0069A8).

What colors go well with #0566BB?

#0566BB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BD5B05. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0566BB below.

Is #0566BB good for buttons?

#0566BB works well for buttons and highlights, but use white text on #0566BB — black text only reaches 3.62:1, below the 4.5:1 needed for normal-size labels.

Is #0566BB the same as CSS royalblue?

No — #0566BB is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#0566BB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0566BB

Not just a swatch — here's how #0566BB works with other colors. Named schemes with #0566BB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #0566BB Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Denim Blue 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 #0566BB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #458CDB

Denim 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 Denim Blue.

Vintage Leather Lead · 5 colors

Lead #0566BB Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

Denim Blue 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 #0566BB Surface #EDE9D6 Anchor #5A2145 Accent #E4C2CB Secondary #322B2F

Denim Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #0566BB Secondary #7892B0 Support #959386 Ink #16140F

Denim 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 Denim Blue carrying the quiet middle.

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Color Lab

How #0566BB 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 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 51/100

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 37/100

Low

A faint retro warmth without tipping into sepia.

Luxury 53/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 42/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 99/100

Very high

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

Surface fit 8/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #0566BB

For UI

For branding

For interior

For fashion

People also use #0566BB with

Turquoise Medium Blue Sienna 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 5.8:1. Use

Subtle surface Use #CAE1F5 for cards and hover fills. Tint 80

Avoid beside #052ABD — 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 #0566BB 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: #0566BB;
  --color-base-rgb: 5 102 187;
  --color-base-oklch: oklch(51.0% 0.155 252.9);
  --color-50: #F0F8FE;
  --color-100: #D8ECFD;
  --color-200: #B1D9FC;
  --color-300: #7ABCF5;
  --color-400: #4A9EE8;
  --color-500: #2780CE;
  --color-600: #26659C;
  --color-700: #214A6E;
  --color-800: #1A3247;
  --color-900: #121F2B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  denim-blue: {
    50: '#F0F8FE',
    100: '#D8ECFD',
    200: '#B1D9FC',
    300: '#7ABCF5',
    400: '#4A9EE8',
    500: '#2780CE',
    600: '#26659C',
    700: '#214A6E',
    800: '#1A3247',
    900: '#121F2B',
  },
}

$base: #0566BB;
$base-ink: #FFFFFF;
$base-50: #F0F8FE;
$base-100: #D8ECFD;
$base-200: #B1D9FC;
$base-300: #7ABCF5;
$base-400: #4A9EE8;
$base-500: #2780CE;
$base-600: #26659C;
$base-700: #214A6E;
$base-800: #1A3247;
$base-900: #121F2B;
$base-hover: #045297;
$base-subtle: #ADD2F2;

{
    "color": {
        "base": {
            "value": "#0566BB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F8FE",
                "type": "color"
            },
            "100": {
                "value": "#D8ECFD",
                "type": "color"
            },
            "200": {
                "value": "#B1D9FC",
                "type": "color"
            },
            "300": {
                "value": "#7ABCF5",
                "type": "color"
            },
            "400": {
                "value": "#4A9EE8",
                "type": "color"
            },
            "500": {
                "value": "#2780CE",
                "type": "color"
            },
            "600": {
                "value": "#26659C",
                "type": "color"
            },
            "700": {
                "value": "#214A6E",
                "type": "color"
            },
            "800": {
                "value": "#1A3247",
                "type": "color"
            },
            "900": {
                "value": "#121F2B",
                "type": "color"
            }
        }
    }
}

Palettes built on #0566BB

Color Lab

Pairs with #0566BB

UI roles & guardrails

In real applications

Scales

Every model

Export