What color is #18366A?

#18366A is a dark blue. In RGB it is rgb(24, 54, 106), and in HSL hsl(218, 63%, 25%).

Is #18366A accessible as text?

On white, #18366A has a contrast ratio of 11.83:1 (passes WCAG AA for body text); on black it is 1.77:1 (fails). For text placed on #18366A, use white for the best readability.

What is the closest Tailwind color to #18366A?

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

What colors go well with #18366A?

#18366A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #684A18. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #18366A below.

Is #18366A good for buttons?

#18366A works well for buttons and highlights, but use white text on #18366A — black text only reaches 1.77:1, below the 4.5:1 needed for normal-size labels.

Is #18366A the same as CSS midnightblue?

No — #18366A is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#18366A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #18366A

Not just a swatch — here's how #18366A works with other colors. Named schemes with #18366A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #18366A Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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 #18366A Anchor #141210 Accent #ADAE53 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 #18366A Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #15153A

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 #18366A Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

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 #18366A Secondary #535F72 Support #9D8F88 Ink #18140F

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 #18366A 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 25/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 65/100

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 41/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 70/100

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 50/100

Moderate

Workable accent with care around contrast.

Surface fit 33/100

Low

Usable as a tinted surface in measured doses.

Print safety 81/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #18366A

For UI

For branding

For interior

For fashion

People also use #18366A with

Teal 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 11.8:1. Use

Subtle surface Use #C7D4EA for cards and hover fills. Tint 80

Avoid beside #181A68 — 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 #18366A 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: #18366A;
  --color-base-rgb: 24 54 106;
  --color-base-oklch: oklch(34.1% 0.098 260.6);
  --color-50: #F2F6FD;
  --color-100: #DDE7F8;
  --color-200: #BDCFF0;
  --color-300: #8FADE0;
  --color-400: #658BCD;
  --color-500: #436CB2;
  --color-600: #3A5688;
  --color-700: #2E4161;
  --color-800: #212C40;
  --color-900: #161C27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F2F6FD',
    100: '#DDE7F8',
    200: '#BDCFF0',
    300: '#8FADE0',
    400: '#658BCD',
    500: '#436CB2',
    600: '#3A5688',
    700: '#2E4161',
    800: '#212C40',
    900: '#161C27',
  },
}

$base: #18366A;
$base-ink: #FFFFFF;
$base-50: #F2F6FD;
$base-100: #DDE7F8;
$base-200: #BDCFF0;
$base-300: #8FADE0;
$base-400: #658BCD;
$base-500: #436CB2;
$base-600: #3A5688;
$base-700: #2E4161;
$base-800: #212C40;
$base-900: #161C27;
$base-hover: #132A53;
$base-subtle: #AABEE1;

{
    "color": {
        "base": {
            "value": "#18366A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F6FD",
                "type": "color"
            },
            "100": {
                "value": "#DDE7F8",
                "type": "color"
            },
            "200": {
                "value": "#BDCFF0",
                "type": "color"
            },
            "300": {
                "value": "#8FADE0",
                "type": "color"
            },
            "400": {
                "value": "#658BCD",
                "type": "color"
            },
            "500": {
                "value": "#436CB2",
                "type": "color"
            },
            "600": {
                "value": "#3A5688",
                "type": "color"
            },
            "700": {
                "value": "#2E4161",
                "type": "color"
            },
            "800": {
                "value": "#212C40",
                "type": "color"
            },
            "900": {
                "value": "#161C27",
                "type": "color"
            }
        }
    }
}