What color is #03436B?

#03436B is a dark, vivid cyan-blue. In RGB it is rgb(3, 67, 107), and in HSL hsl(203, 95%, 22%).

Is #03436B accessible as text?

On white, #03436B has a contrast ratio of 10.40:1 (passes WCAG AA for body text); on black it is 2.02:1 (fails). For text placed on #03436B, use white for the best readability.

What is the closest Tailwind color to #03436B?

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

What colors go well with #03436B?

#03436B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #6D2C03. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #03436B below.

Is #03436B good for buttons?

#03436B works well for buttons and highlights, but use white text on #03436B — black text only reaches 2.02:1, below the 4.5:1 needed for normal-size labels.

Is #03436B the same as CSS darkslategray?

No — #03436B is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#03436B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #03436B

Not just a swatch — here's how #03436B works with other colors. Named schemes with #03436B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #03436B Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A0 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 #03436B 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 #03436B Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #35658B

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 #03436B Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

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 #03436B Secondary #576877 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.

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Color Lab

How #03436B 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 24/100

Cool

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

Softness 33/100

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 44/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 35/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 58/100

Moderate

Workable accent with care around contrast.

Surface fit 34/100

Low

Usable as a tinted surface in measured doses.

Print safety 79/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #03436B

For UI

For branding

For interior

For fashion

People also use #03436B with

Dark Cyan Navy Blue Espresso 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 10.4:1. Use

Subtle surface Use #BCDEF2 for cards and hover fills. Tint 80

Avoid beside #03216D — 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 #03436B 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: #03436B;
  --color-base-rgb: 3 67 107;
  --color-base-oklch: oklch(36.9% 0.090 244.3);
  --color-50: #F0F9FE;
  --color-100: #D8EFFD;
  --color-200: #B1DFFC;
  --color-300: #7AC6F5;
  --color-400: #4AABE8;
  --color-500: #278ECE;
  --color-600: #266F9C;
  --color-700: #21506E;
  --color-800: #1A3647;
  --color-900: #12222B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F0F9FE',
    100: '#D8EFFD',
    200: '#B1DFFC',
    300: '#7AC6F5',
    400: '#4AABE8',
    500: '#278ECE',
    600: '#266F9C',
    700: '#21506E',
    800: '#1A3647',
    900: '#12222B',
  },
}

$base: #03436B;
$base-ink: #FFFFFF;
$base-50: #F0F9FE;
$base-100: #D8EFFD;
$base-200: #B1DFFC;
$base-300: #7AC6F5;
$base-400: #4AABE8;
$base-500: #278ECE;
$base-600: #266F9C;
$base-700: #21506E;
$base-800: #1A3647;
$base-900: #12222B;
$base-hover: #023758;
$base-subtle: #98CDEE;

{
    "color": {
        "base": {
            "value": "#03436B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F9FE",
                "type": "color"
            },
            "100": {
                "value": "#D8EFFD",
                "type": "color"
            },
            "200": {
                "value": "#B1DFFC",
                "type": "color"
            },
            "300": {
                "value": "#7AC6F5",
                "type": "color"
            },
            "400": {
                "value": "#4AABE8",
                "type": "color"
            },
            "500": {
                "value": "#278ECE",
                "type": "color"
            },
            "600": {
                "value": "#266F9C",
                "type": "color"
            },
            "700": {
                "value": "#21506E",
                "type": "color"
            },
            "800": {
                "value": "#1A3647",
                "type": "color"
            },
            "900": {
                "value": "#12222B",
                "type": "color"
            }
        }
    }
}

Palettes built on #03436B

Color Lab

Pairs with #03436B

UI roles & guardrails

In real applications

Scales

Every model

Export