What color is #004271?

#004271 is a dark, vivid cyan-blue. In RGB it is rgb(0, 66, 113), and in HSL hsl(205, 100%, 22%).

Is #004271 accessible as text?

On white, #004271 has a contrast ratio of 10.41:1 (passes WCAG AA for body text); on black it is 2.02:1 (fails). For text placed on #004271, use white for the best readability.

What is the closest Tailwind color to #004271?

The nearest Tailwind CSS token is sky-900 (#024A70).

What colors go well with #004271?

#004271 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #702F00. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #004271 below.

Is #004271 good for buttons?

#004271 works well for buttons and highlights, but use white text on #004271 — black text only reaches 2.02:1, below the 4.5:1 needed for normal-size labels.

Is #004271 the same as CSS darkslategray?

No — #004271 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#004271 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #004271

Not just a swatch — here's how #004271 works with other colors. Named schemes with #004271 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #004271 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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

Luxury Packaging Feature · 5 colors

Feature #004271 Anchor #141210 Accent #AFAD52 Secondary #212A32 Surface #F0EEE3

Classic Blue carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors

Color #004271 Anchor #2A2A2E Secondary #6D6E74 Surface #E9E7DA Accent #121F43

Classic Blue adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Classic Blue.

Vintage Leather Lead · 5 colors

Lead #004271 Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233B

Classic 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.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #004271 Secondary #576879 Support #969386 Ink #16140F

Classic 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 Classic Blue carrying the quiet middle.

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Color Lab

How #004271 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 22/100

Cool

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

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 42/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 38/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 60/100

Moderate

Workable accent with care around contrast.

Surface fit 31/100

Low

Usable as a tinted surface in measured doses.

Print safety 78/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #004271

For UI

For branding

For interior

For fashion

People also use #004271 with

Persian Green Navy Blue Espresso 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 10.4:1. Use

Subtle surface Use #BBDCF4 for cards and hover fills. Tint 80

Avoid beside #001C70 — 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 #004271 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: #004271;
  --color-base-rgb: 0 66 113;
  --color-base-oklch: oklch(37.0% 0.099 247.9);
  --color-50: #F0F9FE;
  --color-100: #D8EEFD;
  --color-200: #B1DCFC;
  --color-300: #77C2F8;
  --color-400: #46A7EC;
  --color-500: #2289D2;
  --color-600: #236B9F;
  --color-700: #1F4E70;
  --color-800: #183448;
  --color-900: #11212C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F0F9FE',
    100: '#D8EEFD',
    200: '#B1DCFC',
    300: '#77C2F8',
    400: '#46A7EC',
    500: '#2289D2',
    600: '#236B9F',
    700: '#1F4E70',
    800: '#183448',
    900: '#11212C',
  },
}

$base: #004271;
$base-ink: #FFFFFF;
$base-50: #F0F9FE;
$base-100: #D8EEFD;
$base-200: #B1DCFC;
$base-300: #77C2F8;
$base-400: #46A7EC;
$base-500: #2289D2;
$base-600: #236B9F;
$base-700: #1F4E70;
$base-800: #183448;
$base-900: #11212C;
$base-hover: #00345A;
$base-subtle: #96CBF1;

{
    "color": {
        "base": {
            "value": "#004271",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F9FE",
                "type": "color"
            },
            "100": {
                "value": "#D8EEFD",
                "type": "color"
            },
            "200": {
                "value": "#B1DCFC",
                "type": "color"
            },
            "300": {
                "value": "#77C2F8",
                "type": "color"
            },
            "400": {
                "value": "#46A7EC",
                "type": "color"
            },
            "500": {
                "value": "#2289D2",
                "type": "color"
            },
            "600": {
                "value": "#236B9F",
                "type": "color"
            },
            "700": {
                "value": "#1F4E70",
                "type": "color"
            },
            "800": {
                "value": "#183448",
                "type": "color"
            },
            "900": {
                "value": "#11212C",
                "type": "color"
            }
        }
    }
}

Palettes built on #004271

Color Lab

Pairs with #004271

UI roles & guardrails

In real applications

Scales

Every model

Export