What color is #183E71?

#183E71 is a dark blue. In RGB it is rgb(24, 62, 113), and in HSL hsl(214, 65%, 27%).

Is #183E71 accessible as text?

On white, #183E71 has a contrast ratio of 10.68:1 (passes WCAG AA for body text); on black it is 1.97:1 (fails). For text placed on #183E71, use white for the best readability.

What is the closest Tailwind color to #183E71?

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

What colors go well with #183E71?

#183E71 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #724B18. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #183E71 below.

Is #183E71 good for buttons?

#183E71 works well for buttons and highlights, but use white text on #183E71 — black text only reaches 1.97:1, below the 4.5:1 needed for normal-size labels.

Is #183E71 the same as CSS darkslateblue?

No — #183E71 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#183E71 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #183E71

Not just a swatch — here's how #183E71 works with other colors. Named schemes with #183E71 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #183E71 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.

Luxury Packaging Feature · 5 colors

Feature #183E71 Anchor #141210 Accent #AEAE53 Secondary #232933 Surface #F0EEE3

Yale 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 #183E71 Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #181C41

Yale 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 Yale Blue.

Vintage Leather Lead · 5 colors

Lead #183E71 Secondary #7F4537 Surface #E1DDC1 Accent #375246 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 #183E71 Secondary #596679 Support #9D8F89 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 #183E71 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 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

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 43/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 38/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 58/100

Moderate

Workable accent with care around contrast.

Surface fit 31/100

Low

Usable as a tinted surface in measured doses.

Print safety 80/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #183E71

For UI

For branding

For interior

For fashion

People also use #183E71 with

Dark Cyan Midnight Blue Sepia 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 10.7:1. Use

Subtle surface Use #C8D7EB for cards and hover fills. Tint 80

Avoid beside #182172 — 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 #183E71 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: #183E71;
  --color-base-rgb: 24 62 113;
  --color-base-oklch: oklch(36.6% 0.098 256.8);
  --color-50: #F2F7FD;
  --color-100: #DDE9F9;
  --color-200: #BCD3F1;
  --color-300: #8EB2E2;
  --color-400: #6392CF;
  --color-500: #4173B4;
  --color-600: #385C89;
  --color-700: #2D4462;
  --color-800: #212E40;
  --color-900: #161D27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F2F7FD',
    100: '#DDE9F9',
    200: '#BCD3F1',
    300: '#8EB2E2',
    400: '#6392CF',
    500: '#4173B4',
    600: '#385C89',
    700: '#2D4462',
    800: '#212E40',
    900: '#161D27',
  },
}

$base: #183E71;
$base-ink: #FFFFFF;
$base-50: #F2F7FD;
$base-100: #DDE9F9;
$base-200: #BCD3F1;
$base-300: #8EB2E2;
$base-400: #6392CF;
$base-500: #4173B4;
$base-600: #385C89;
$base-700: #2D4462;
$base-800: #212E40;
$base-900: #161D27;
$base-hover: #13325B;
$base-subtle: #ACC3E3;

{
    "color": {
        "base": {
            "value": "#183E71",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F7FD",
                "type": "color"
            },
            "100": {
                "value": "#DDE9F9",
                "type": "color"
            },
            "200": {
                "value": "#BCD3F1",
                "type": "color"
            },
            "300": {
                "value": "#8EB2E2",
                "type": "color"
            },
            "400": {
                "value": "#6392CF",
                "type": "color"
            },
            "500": {
                "value": "#4173B4",
                "type": "color"
            },
            "600": {
                "value": "#385C89",
                "type": "color"
            },
            "700": {
                "value": "#2D4462",
                "type": "color"
            },
            "800": {
                "value": "#212E40",
                "type": "color"
            },
            "900": {
                "value": "#161D27",
                "type": "color"
            }
        }
    }
}