What color is #0047AB?

Cobalt Blue (#0047AB) is a dark, vivid blue. In RGB it is rgb(0, 71, 171), and in HSL hsl(215, 100%, 34%).

Is #0047AB accessible as text?

On white, #0047AB has a contrast ratio of 8.44:1 (passes WCAG AA for body text); on black it is 2.49:1 (fails). For text placed on #0047AB, use white for the best readability.

What is the closest Tailwind color to #0047AB?

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

What colors go well with #0047AB?

#0047AB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #AD6500. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0047AB below.

Is Cobalt Blue good for buttons?

Cobalt Blue works well for buttons and highlights, but use white text on #0047AB — black text only reaches 2.49:1, below the 4.5:1 needed for normal-size labels.

Is Cobalt Blue a CSS named color?

No — Cobalt Blue is not a standard CSS named color; use the hex value #0047AB in CSS. The closest CSS named color is darkslateblue.

Why is it called Cobalt Blue?

Cobalt blue is named after the metal used to make an intense blue pigment and glass. It is a strong, vivid blue.

Cobalt Blue (#0047AB) Color Palette, HEX, RGB & Design Ideas

Palettes built on Cobalt Blue

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

Coastal Morning Lead · 5 colors

Lead #0047AB Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Cobalt 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 #0047AB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #356ECA

Cobalt 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 Cobalt Blue.

Vintage Leather Lead · 5 colors

Lead #0047AB Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Cobalt 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 #0047AB Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Cobalt 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 #0047AB Secondary #62789B Support #9D8F88 Ink #16140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How Cobalt Blue 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 7/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 60/100

High

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 28/100

Low

A faint retro warmth without tipping into sepia.

Luxury 59/100

Moderate

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

Brand distinctiveness 46/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 80/100

Very high

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

Surface fit 12/100

Very low

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

Print safety 66/100

High

Prints close, with a slight loss of vibrancy.

Pairs with Cobalt Blue

For UI

For branding

For interior

For fashion

People also use Cobalt Blue with

Dark Turquoise Zaffre Olive Brown 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 8.4:1. Use

Subtle surface Use #C5D9F6 for cards and hover fills. Tint 80

Avoid beside #000EAD — 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 Cobalt Blue 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: #0047AB;
  --color-base-rgb: 0 71 171;
  --color-base-oklch: oklch(42.8% 0.172 259.7);
  --color-50: #F0F6FE;
  --color-100: #D8E7FD;
  --color-200: #B1D0FC;
  --color-300: #77ADF8;
  --color-400: #468BEC;
  --color-500: #226CD2;
  --color-600: #23579F;
  --color-700: #1F4170;
  --color-800: #182C48;
  --color-900: #111C2C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F0F6FE',
    100: '#D8E7FD',
    200: '#B1D0FC',
    300: '#77ADF8',
    400: '#468BEC',
    500: '#226CD2',
    600: '#23579F',
    700: '#1F4170',
    800: '#182C48',
    900: '#111C2C',
  },
}

$base: #0047AB;
$base-ink: #FFFFFF;
$base-50: #F0F6FE;
$base-100: #D8E7FD;
$base-200: #B1D0FC;
$base-300: #77ADF8;
$base-400: #468BEC;
$base-500: #226CD2;
$base-600: #23579F;
$base-700: #1F4170;
$base-800: #182C48;
$base-900: #111C2C;
$base-hover: #003A8B;
$base-subtle: #A6C6F3;

{
    "color": {
        "base": {
            "value": "#0047AB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F6FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E7FD",
                "type": "color"
            },
            "200": {
                "value": "#B1D0FC",
                "type": "color"
            },
            "300": {
                "value": "#77ADF8",
                "type": "color"
            },
            "400": {
                "value": "#468BEC",
                "type": "color"
            },
            "500": {
                "value": "#226CD2",
                "type": "color"
            },
            "600": {
                "value": "#23579F",
                "type": "color"
            },
            "700": {
                "value": "#1F4170",
                "type": "color"
            },
            "800": {
                "value": "#182C48",
                "type": "color"
            },
            "900": {
                "value": "#111C2C",
                "type": "color"
            }
        }
    }
}