What color is #04597B?

#04597B is a dark, vivid cyan-blue. In RGB it is rgb(4, 89, 123), and in HSL hsl(197, 94%, 25%).

Is #04597B accessible as text?

On white, #04597B has a contrast ratio of 7.72:1 (passes WCAG AA for body text); on black it is 2.72:1 (fails). For text placed on #04597B, use white for the best readability.

What is the closest Tailwind color to #04597B?

The nearest Tailwind CSS token is cyan-800 (#005F78).

What colors go well with #04597B?

#04597B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #7C2604. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #04597B below.

Is #04597B good for buttons?

#04597B works well for buttons and highlights, but use white text on #04597B — black text only reaches 2.72:1, below the 4.5:1 needed for normal-size labels.

Is #04597B the same as CSS darkslategray?

No — #04597B is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#04597B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #04597B

Not just a swatch — here's how #04597B works with other colors. Named schemes with #04597B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #04597B Accent #A6C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Classic 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 #04597B Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Classic 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 #04597B Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3E7B9B

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 #04597B Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #57233D

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 #04597B Secondary #687D89 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.

Build a working theme in the generator →

Color Lab

How #04597B 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 23/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 56/100

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 50/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 61/100

High

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

Brand distinctiveness 24/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 77/100

High

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

Surface fit 29/100

Low

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

Print safety 77/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #04597B

For UI

For branding

For interior

For fashion

People also use #04597B with

Jade Green Phthalo Blue Garnet Platinum 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 7.7:1. Use

Subtle surface Use #BFE4F3 for cards and hover fills. Tint 80

Avoid beside #04327C — 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 #04597B 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: #04597B;
  --color-base-rgb: 4 89 123;
  --color-base-oklch: oklch(43.7% 0.089 233.6);
  --color-50: #F0FAFE;
  --color-100: #D8F3FD;
  --color-200: #B1E6FC;
  --color-300: #7BD2F4;
  --color-400: #4BBBE7;
  --color-500: #289ECD;
  --color-600: #267A9B;
  --color-700: #21586D;
  --color-800: #1A3A47;
  --color-900: #12242B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F0FAFE',
    100: '#D8F3FD',
    200: '#B1E6FC',
    300: '#7BD2F4',
    400: '#4BBBE7',
    500: '#289ECD',
    600: '#267A9B',
    700: '#21586D',
    800: '#1A3A47',
    900: '#12242B',
  },
}

$base: #04597B;
$base-ink: #FFFFFF;
$base-50: #F0FAFE;
$base-100: #D8F3FD;
$base-200: #B1E6FC;
$base-300: #7BD2F4;
$base-400: #4BBBE7;
$base-500: #289ECD;
$base-600: #267A9B;
$base-700: #21586D;
$base-800: #1A3A47;
$base-900: #12242B;
$base-hover: #034863;
$base-subtle: #9DD7EF;

{
    "color": {
        "base": {
            "value": "#04597B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FAFE",
                "type": "color"
            },
            "100": {
                "value": "#D8F3FD",
                "type": "color"
            },
            "200": {
                "value": "#B1E6FC",
                "type": "color"
            },
            "300": {
                "value": "#7BD2F4",
                "type": "color"
            },
            "400": {
                "value": "#4BBBE7",
                "type": "color"
            },
            "500": {
                "value": "#289ECD",
                "type": "color"
            },
            "600": {
                "value": "#267A9B",
                "type": "color"
            },
            "700": {
                "value": "#21586D",
                "type": "color"
            },
            "800": {
                "value": "#1A3A47",
                "type": "color"
            },
            "900": {
                "value": "#12242B",
                "type": "color"
            }
        }
    }
}

Palettes built on #04597B

Color Lab

Pairs with #04597B

UI roles & guardrails

In real applications

Scales

Every model

Export