What color is #183C85?

#183C85 is a dark blue. In RGB it is rgb(24, 60, 133), and in HSL hsl(220, 69%, 31%).

Is #183C85 accessible as text?

On white, #183C85 has a contrast ratio of 10.38:1 (passes WCAG AA for body text); on black it is 2.02:1 (fails). For text placed on #183C85, use white for the best readability.

What is the closest Tailwind color to #183C85?

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

What colors go well with #183C85?

#183C85 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #866119. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #183C85 below.

Is #183C85 good for buttons?

#183C85 works well for buttons and highlights, but use white text on #183C85 — black text only reaches 2.02:1, below the 4.5:1 needed for normal-size labels.

Is #183C85 the same as CSS darkslateblue?

No — #183C85 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#183C85 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #183C85

Not just a swatch — here's how #183C85 works with other colors. Named schemes with #183C85 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #183C85 Anchor #141210 Accent #ADAE53 Secondary #242933 Surface #F0EEE3

Classic 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 #183C85 Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #1D1A4D

Classic 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 Classic Blue.

Coastal Morning Lead · 5 colors

Lead #183C85 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Classic 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 #183C85 Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Classic 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 #183C85 Secondary #5A6883 Support #9D8F88 Ink #18140F

Classic 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 Classic Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #183C85 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 17/100

Cool

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

Softness 31/100

Low

Firm and assertive — carries weight and contrast.

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 36/100

Low

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 50/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 66/100

High

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

Surface fit 21/100

Low

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

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #183C85

For UI

For branding

For interior

For fashion

People also use #183C85 with

Bondi Blue Midnight Blue Raw Umber 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 #CAD6ED for cards and hover fills. Tint 80

Avoid beside #191986 — 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 #183C85 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: #183C85;
  --color-base-rgb: 24 60 133;
  --color-base-oklch: oklch(37.7% 0.130 262.3);
  --color-50: #F2F5FD;
  --color-100: #DCE6F9;
  --color-200: #BACDF2;
  --color-300: #8BA9E4;
  --color-400: #6086D2;
  --color-500: #3E66B7;
  --color-600: #36538C;
  --color-700: #2C3E63;
  --color-800: #202B41;
  --color-900: #151B28;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F2F5FD',
    100: '#DCE6F9',
    200: '#BACDF2',
    300: '#8BA9E4',
    400: '#6086D2',
    500: '#3E66B7',
    600: '#36538C',
    700: '#2C3E63',
    800: '#202B41',
    900: '#151B28',
  },
}

$base: #183C85;
$base-ink: #FFFFFF;
$base-50: #F2F5FD;
$base-100: #DCE6F9;
$base-200: #BACDF2;
$base-300: #8BA9E4;
$base-400: #6086D2;
$base-500: #3E66B7;
$base-600: #36538C;
$base-700: #2C3E63;
$base-800: #202B41;
$base-900: #151B28;
$base-hover: #14316B;
$base-subtle: #AFC1E6;

{
    "color": {
        "base": {
            "value": "#183C85",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F5FD",
                "type": "color"
            },
            "100": {
                "value": "#DCE6F9",
                "type": "color"
            },
            "200": {
                "value": "#BACDF2",
                "type": "color"
            },
            "300": {
                "value": "#8BA9E4",
                "type": "color"
            },
            "400": {
                "value": "#6086D2",
                "type": "color"
            },
            "500": {
                "value": "#3E66B7",
                "type": "color"
            },
            "600": {
                "value": "#36538C",
                "type": "color"
            },
            "700": {
                "value": "#2C3E63",
                "type": "color"
            },
            "800": {
                "value": "#202B41",
                "type": "color"
            },
            "900": {
                "value": "#151B28",
                "type": "color"
            }
        }
    }
}

Palettes built on #183C85

Color Lab

Pairs with #183C85

UI roles & guardrails

In real applications

Scales

Every model

Export