What color is #183A8A?

#183A8A is a dark, vivid blue. In RGB it is rgb(24, 58, 138), and in HSL hsl(222, 70%, 32%).

Is #183A8A accessible as text?

On white, #183A8A has a contrast ratio of 10.44:1 (passes WCAG AA for body text); on black it is 2.01:1 (fails). For text placed on #183A8A, use white for the best readability.

What is the closest Tailwind color to #183A8A?

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

What colors go well with #183A8A?

#183A8A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8B6818. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #183A8A below.

Is #183A8A good for buttons?

#183A8A works well for buttons and highlights, but use white text on #183A8A — black text only reaches 2.01:1, below the 4.5:1 needed for normal-size labels.

Is #183A8A the same as CSS darkslateblue?

No — #183A8A is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#183A8A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #183A8A

Not just a swatch — here's how #183A8A works with other colors. Named schemes with #183A8A in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #183A8A Anchor #141210 Accent #ACAE53 Secondary #242933 Surface #F0EEE3

Egyptian 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 #183A8A Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #1E1850

Egyptian 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 Egyptian Blue.

Coastal Morning Lead · 5 colors

Lead #183A8A Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Egyptian 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 #183A8A Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Egyptian 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 #183A8A Secondary #5A6885 Support #9D8F88 Ink #18140F

Egyptian 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 Egyptian Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #183A8A 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 15/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 64/100

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 34/100

Low

A faint retro warmth without tipping into sepia.

Luxury 66/100

High

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

Brand distinctiveness 54/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 67/100

High

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

Surface fit 18/100

Very low

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

Print safety 74/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #183A8A

For UI

For branding

For interior

For fashion

People also use #183A8A with

Bondi Blue Indigo 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 10.4:1. Use

Subtle surface Use #CBD5EE for cards and hover fills. Tint 80

Avoid beside #1C188B — 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 #183A8A 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: #183A8A;
  --color-base-rgb: 24 58 138;
  --color-base-oklch: oklch(37.7% 0.139 263.6);
  --color-50: #F1F5FD;
  --color-100: #DBE5FA;
  --color-200: #BACBF3;
  --color-300: #8AA6E5;
  --color-400: #5F82D3;
  --color-500: #3D62B8;
  --color-600: #354F8C;
  --color-700: #2B3C64;
  --color-800: #202A41;
  --color-900: #151B28;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  egyptian-blue: {
    50: '#F1F5FD',
    100: '#DBE5FA',
    200: '#BACBF3',
    300: '#8AA6E5',
    400: '#5F82D3',
    500: '#3D62B8',
    600: '#354F8C',
    700: '#2B3C64',
    800: '#202A41',
    900: '#151B28',
  },
}

$base: #183A8A;
$base-ink: #FFFFFF;
$base-50: #F1F5FD;
$base-100: #DBE5FA;
$base-200: #BACBF3;
$base-300: #8AA6E5;
$base-400: #5F82D3;
$base-500: #3D62B8;
$base-600: #354F8C;
$base-700: #2B3C64;
$base-800: #202A41;
$base-900: #151B28;
$base-hover: #142F6F;
$base-subtle: #AFC0E7;

{
    "color": {
        "base": {
            "value": "#183A8A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F5FD",
                "type": "color"
            },
            "100": {
                "value": "#DBE5FA",
                "type": "color"
            },
            "200": {
                "value": "#BACBF3",
                "type": "color"
            },
            "300": {
                "value": "#8AA6E5",
                "type": "color"
            },
            "400": {
                "value": "#5F82D3",
                "type": "color"
            },
            "500": {
                "value": "#3D62B8",
                "type": "color"
            },
            "600": {
                "value": "#354F8C",
                "type": "color"
            },
            "700": {
                "value": "#2B3C64",
                "type": "color"
            },
            "800": {
                "value": "#202A41",
                "type": "color"
            },
            "900": {
                "value": "#151B28",
                "type": "color"
            }
        }
    }
}

Palettes built on #183A8A

Color Lab

Pairs with #183A8A

UI roles & guardrails

In real applications

Scales

Every model

Export