What color is #04375E?

#04375E is a dark, vivid cyan-blue. In RGB it is rgb(4, 55, 94), and in HSL hsl(206, 92%, 19%).

Is #04375E accessible as text?

On white, #04375E has a contrast ratio of 12.26:1 (passes WCAG AA for body text); on black it is 1.71:1 (fails). For text placed on #04375E, use white for the best readability.

What is the closest Tailwind color to #04375E?

The nearest Tailwind CSS token is sky-950 (#052F4A).

What colors go well with #04375E?

#04375E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #5D2B04. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #04375E below.

Is #04375E good for buttons?

#04375E works well for buttons and highlights, but use white text on #04375E — black text only reaches 1.71:1, below the 4.5:1 needed for normal-size labels.

Is #04375E the same as CSS midnightblue?

No — #04375E is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#04375E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #04375E

Not just a swatch — here's how #04375E works with other colors. Named schemes with #04375E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #04375E Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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

Nordic Calm Accent · 5 colors

Accent #04375E Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Yale Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #04375E Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #30587D

Yale 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 Yale Blue.

Vintage Leather Lead · 5 colors

Lead #04375E Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233B

Yale 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 #04375E Secondary #4E5C6B Support #969386 Ink #16140F

Yale 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 Yale Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #04375E 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 26/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 66/100

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

Low

A faint retro warmth without tipping into sepia.

Luxury 70/100

High

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

Brand distinctiveness 33/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 44/100

Moderate

Workable accent with care around contrast.

Surface fit 38/100

Low

Usable as a tinted surface in measured doses.

Print safety 81/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #04375E

For UI

For branding

For interior

For fashion

People also use #04375E with

Teal Green Navy 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 12.3:1. Use

Subtle surface Use #BAD9F1 for cards and hover fills. Tint 80

Avoid beside #04195D — 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 #04375E at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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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: #04375E;
  --color-base-rgb: 4 55 94;
  --color-base-oklch: oklch(32.9% 0.085 248.1);
  --color-50: #F0F8FE;
  --color-100: #D8EDFD;
  --color-200: #B1DBFC;
  --color-300: #7CC0F3;
  --color-400: #4DA3E5;
  --color-500: #2985CB;
  --color-600: #28699A;
  --color-700: #224C6D;
  --color-800: #1A3347;
  --color-900: #12202B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F0F8FE',
    100: '#D8EDFD',
    200: '#B1DBFC',
    300: '#7CC0F3',
    400: '#4DA3E5',
    500: '#2985CB',
    600: '#28699A',
    700: '#224C6D',
    800: '#1A3347',
    900: '#12202B',
  },
}

$base: #04375E;
$base-ink: #FFFFFF;
$base-50: #F0F8FE;
$base-100: #D8EDFD;
$base-200: #B1DBFC;
$base-300: #7CC0F3;
$base-400: #4DA3E5;
$base-500: #2985CB;
$base-600: #28699A;
$base-700: #224C6D;
$base-800: #1A3347;
$base-900: #12202B;
$base-hover: #032C4A;
$base-subtle: #96C7EC;

{
    "color": {
        "base": {
            "value": "#04375E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F8FE",
                "type": "color"
            },
            "100": {
                "value": "#D8EDFD",
                "type": "color"
            },
            "200": {
                "value": "#B1DBFC",
                "type": "color"
            },
            "300": {
                "value": "#7CC0F3",
                "type": "color"
            },
            "400": {
                "value": "#4DA3E5",
                "type": "color"
            },
            "500": {
                "value": "#2985CB",
                "type": "color"
            },
            "600": {
                "value": "#28699A",
                "type": "color"
            },
            "700": {
                "value": "#224C6D",
                "type": "color"
            },
            "800": {
                "value": "#1A3347",
                "type": "color"
            },
            "900": {
                "value": "#12202B",
                "type": "color"
            }
        }
    }
}