What color is #183B60?

#183B60 is a dark blue. In RGB it is rgb(24, 59, 96), and in HSL hsl(211, 60%, 24%).

Is #183B60 accessible as text?

On white, #183B60 has a contrast ratio of 11.45:1 (passes WCAG AA for body text); on black it is 1.83:1 (fails). For text placed on #183B60, use white for the best readability.

What is the closest Tailwind color to #183B60?

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

What colors go well with #183B60?

#183B60 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #623E18. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #183B60 below.

Is #183B60 good for buttons?

#183B60 works well for buttons and highlights, but use white text on #183B60 — black text only reaches 1.83:1, below the 4.5:1 needed for normal-size labels.

Is #183B60 the same as CSS darkslategray?

No — #183B60 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#183B60 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #183B60

Not just a swatch — here's how #183B60 works with other colors. Named schemes with #183B60 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #183B60 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.

Nordic Calm Accent · 5 colors

Accent #183B60 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 #183B60 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3C5C80

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 #183B60 Secondary #7F4537 Surface #E1DDC0 Accent #375245 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 #183B60 Secondary #55616F Support #959386 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 #183B60 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 29/100

Cool

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

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

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 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 30/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 47/100

Moderate

Workable accent with care around contrast.

Surface fit 39/100

Low

Usable as a tinted surface in measured doses.

Print safety 84/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #183B60

For UI

For branding

For interior

For fashion

People also use #183B60 with

Teal Green 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 11.5:1. Use

Subtle surface Use #C7D8E9 for cards and hover fills. Tint 80

Avoid beside #182362 — 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 #183B60 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: #183B60;
  --color-base-rgb: 24 59 96;
  --color-base-oklch: oklch(34.7% 0.077 252.0);
  --color-50: #F2F7FC;
  --color-100: #DEEAF8;
  --color-200: #BED5EF;
  --color-300: #91B6DE;
  --color-400: #6797CB;
  --color-500: #4679AF;
  --color-600: #3C6086;
  --color-700: #2F4760;
  --color-800: #22303F;
  --color-900: #161E27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F2F7FC',
    100: '#DEEAF8',
    200: '#BED5EF',
    300: '#91B6DE',
    400: '#6797CB',
    500: '#4679AF',
    600: '#3C6086',
    700: '#2F4760',
    800: '#22303F',
    900: '#161E27',
  },
}

$base: #183B60;
$base-ink: #FFFFFF;
$base-50: #F2F7FC;
$base-100: #DEEAF8;
$base-200: #BED5EF;
$base-300: #91B6DE;
$base-400: #6797CB;
$base-500: #4679AF;
$base-600: #3C6086;
$base-700: #2F4760;
$base-800: #22303F;
$base-900: #161E27;
$base-hover: #14304E;
$base-subtle: #AAC4DF;

{
    "color": {
        "base": {
            "value": "#183B60",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F7FC",
                "type": "color"
            },
            "100": {
                "value": "#DEEAF8",
                "type": "color"
            },
            "200": {
                "value": "#BED5EF",
                "type": "color"
            },
            "300": {
                "value": "#91B6DE",
                "type": "color"
            },
            "400": {
                "value": "#6797CB",
                "type": "color"
            },
            "500": {
                "value": "#4679AF",
                "type": "color"
            },
            "600": {
                "value": "#3C6086",
                "type": "color"
            },
            "700": {
                "value": "#2F4760",
                "type": "color"
            },
            "800": {
                "value": "#22303F",
                "type": "color"
            },
            "900": {
                "value": "#161E27",
                "type": "color"
            }
        }
    }
}