What color is #02437B?

#02437B is a dark, vivid blue. In RGB it is rgb(2, 67, 123), and in HSL hsl(208, 97%, 25%).

Is #02437B accessible as text?

On white, #02437B has a contrast ratio of 10.04:1 (passes WCAG AA for body text); on black it is 2.09:1 (fails). For text placed on #02437B, use white for the best readability.

What is the closest Tailwind color to #02437B?

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

What colors go well with #02437B?

#02437B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #7E3C02. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #02437B below.

Is #02437B good for buttons?

#02437B works well for buttons and highlights, but use white text on #02437B — black text only reaches 2.09:1, below the 4.5:1 needed for normal-size labels.

Is #02437B the same as CSS darkslateblue?

No — #02437B is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#02437B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #02437B

Not just a swatch — here's how #02437B works with other colors. Named schemes with #02437B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #02437B 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.

Tech Product Signal · 5 colors

Signal #02437B Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #34669B

Classic 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 Classic Blue.

Vintage Leather Lead · 5 colors

Lead #02437B Secondary #7F4537 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.

Berry & Cream Lead · 5 colors

Lead #02437B Surface #EDE9D6 Anchor #5A2145 Accent #E4C2CB Secondary #322B2F

Classic 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 #02437B Secondary #596B7F Support #959386 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 #02437B 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 19/100

Cool

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

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 40/100

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 30/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 66/100

High

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

Surface fit 26/100

Low

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

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #02437B

For UI

For branding

For interior

For fashion

People also use #02437B with

Persian Green Navy Blue Sepia 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 10.0:1. Use

Subtle surface Use #BEDBF3 for cards and hover fills. Tint 80

Avoid beside #021B7E — 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 #02437B 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: #02437B;
  --color-base-rgb: 2 67 123;
  --color-base-oklch: oklch(38.0% 0.111 251.8);
  --color-50: #F0F8FE;
  --color-100: #D8ECFD;
  --color-200: #B1D9FC;
  --color-300: #79BCF6;
  --color-400: #499EE9;
  --color-500: #2580D0;
  --color-600: #25659D;
  --color-700: #204A6F;
  --color-800: #193248;
  --color-900: #111F2C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F0F8FE',
    100: '#D8ECFD',
    200: '#B1D9FC',
    300: '#79BCF6',
    400: '#499EE9',
    500: '#2580D0',
    600: '#25659D',
    700: '#204A6F',
    800: '#193248',
    900: '#111F2C',
  },
}

$base: #02437B;
$base-ink: #FFFFFF;
$base-50: #F0F8FE;
$base-100: #D8ECFD;
$base-200: #B1D9FC;
$base-300: #79BCF6;
$base-400: #499EE9;
$base-500: #2580D0;
$base-600: #25659D;
$base-700: #204A6F;
$base-800: #193248;
$base-900: #111F2C;
$base-hover: #023664;
$base-subtle: #9BC8F0;

{
    "color": {
        "base": {
            "value": "#02437B",
            "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": "#79BCF6",
                "type": "color"
            },
            "400": {
                "value": "#499EE9",
                "type": "color"
            },
            "500": {
                "value": "#2580D0",
                "type": "color"
            },
            "600": {
                "value": "#25659D",
                "type": "color"
            },
            "700": {
                "value": "#204A6F",
                "type": "color"
            },
            "800": {
                "value": "#193248",
                "type": "color"
            },
            "900": {
                "value": "#111F2C",
                "type": "color"
            }
        }
    }
}

Palettes built on #02437B

Color Lab

Pairs with #02437B

UI roles & guardrails

In real applications

Scales

Every model

Export