What color is #043199?

#043199 is a dark, vivid blue. In RGB it is rgb(4, 49, 153), and in HSL hsl(222, 95%, 31%).

Is #043199 accessible as text?

On white, #043199 has a contrast ratio of 11.03:1 (passes WCAG AA for body text); on black it is 1.90:1 (fails). For text placed on #043199, use white for the best readability.

What is the closest Tailwind color to #043199?

The nearest Tailwind CSS token is blue-900 (#1C398E).

What colors go well with #043199?

#043199 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9A6D04. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #043199 below.

Is #043199 good for buttons?

#043199 works well for buttons and highlights, but use white text on #043199 — black text only reaches 1.90:1, below the 4.5:1 needed for normal-size labels.

Is #043199 the same as CSS darkblue?

No — #043199 is not the CSS named color darkblue, but darkblue (#00008B) is the closest CSS named color.

#043199 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #043199

Not just a swatch — here's how #043199 works with other colors. Named schemes with #043199 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #043199 Anchor #141210 Accent #ACAE53 Secondary #242933 Surface #F0EEE3

Klein 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 #043199 Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #1C0F58

Klein 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 Klein Blue.

Coastal Morning Lead · 5 colors

Lead #043199 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Vintage Leather Lead · 5 colors

Lead #043199 Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Klein 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 #F8F4EF Accent #043199 Secondary #536589 Support #9D8F88 Ink #18140F

Klein 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 Klein Blue carrying the quiet middle.

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Color Lab

How #043199 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 8/100

Cool

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

Softness 26/100

Low

Firm and assertive — carries weight and contrast.

Depth 67/100

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 25/100

Low

Clean and current — no dusty, aged cast.

Luxury 64/100

High

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

Brand distinctiveness 68/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 60/100

High

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

Surface fit 16/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #043199

For UI

For branding

For interior

For fashion

People also use #043199 with

Light Sea Green Zaffre Olive Brown 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 11.0:1. Use

Subtle surface Use #C4D2F4 for cards and hover fills. Tint 80

Avoid beside #09049A — 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 #043199 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: #043199;
  --color-base-rgb: 4 49 153;
  --color-base-oklch: oklch(36.8% 0.175 263.0);
  --color-50: #F0F5FE;
  --color-100: #D8E3FD;
  --color-200: #B1C7FC;
  --color-300: #7A9FF5;
  --color-400: #4A7AE8;
  --color-500: #2759CE;
  --color-600: #26499C;
  --color-700: #21386E;
  --color-800: #1A2747;
  --color-900: #12192B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F0F5FE',
    100: '#D8E3FD',
    200: '#B1C7FC',
    300: '#7A9FF5',
    400: '#4A7AE8',
    500: '#2759CE',
    600: '#26499C',
    700: '#21386E',
    800: '#1A2747',
    900: '#12192B',
  },
}

$base: #043199;
$base-ink: #FFFFFF;
$base-50: #F0F5FE;
$base-100: #D8E3FD;
$base-200: #B1C7FC;
$base-300: #7A9FF5;
$base-400: #4A7AE8;
$base-500: #2759CE;
$base-600: #26499C;
$base-700: #21386E;
$base-800: #1A2747;
$base-900: #12192B;
$base-hover: #03277B;
$base-subtle: #A4BBF0;

{
    "color": {
        "base": {
            "value": "#043199",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F5FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E3FD",
                "type": "color"
            },
            "200": {
                "value": "#B1C7FC",
                "type": "color"
            },
            "300": {
                "value": "#7A9FF5",
                "type": "color"
            },
            "400": {
                "value": "#4A7AE8",
                "type": "color"
            },
            "500": {
                "value": "#2759CE",
                "type": "color"
            },
            "600": {
                "value": "#26499C",
                "type": "color"
            },
            "700": {
                "value": "#21386E",
                "type": "color"
            },
            "800": {
                "value": "#1A2747",
                "type": "color"
            },
            "900": {
                "value": "#12192B",
                "type": "color"
            }
        }
    }
}

Palettes built on #043199

Color Lab

Pairs with #043199

UI roles & guardrails

In real applications

Scales

Every model

Export