What color is #1B404F?

#1B404F is a dark cyan-blue. In RGB it is rgb(27, 64, 79), and in HSL hsl(197, 49%, 21%).

Is #1B404F accessible as text?

On white, #1B404F has a contrast ratio of 11.09:1 (passes WCAG AA for body text); on black it is 1.89:1 (fails). For text placed on #1B404F, use white for the best readability.

What is the closest Tailwind color to #1B404F?

The nearest Tailwind CSS token is mist-700 (#394447).

What colors go well with #1B404F?

#1B404F pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #502A1B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1B404F below.

Is #1B404F good for buttons?

#1B404F works well for buttons and highlights, but use white text on #1B404F — black text only reaches 1.89:1, below the 4.5:1 needed for normal-size labels.

Is #1B404F the same as CSS darkslategray?

No — #1B404F is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#1B404F Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1B404F

Not just a swatch — here's how #1B404F works with other colors. Named schemes with #1B404F in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1B404F Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Charcoal 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 #1B404F Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Charcoal 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 #1B404F Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #40616F

Charcoal is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Charcoal.

Vintage Leather Lead · 5 colors

Lead #1B404F Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #56233D

Charcoal 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 #1B404F Secondary #576369 Support #969386 Ink #16140F

Charcoal 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 Charcoal carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #1B404F 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 35/100

Cool

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

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 65/100

High

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

Brand distinctiveness 19/100

Very low

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

UI accent fit 41/100

Moderate

Workable accent with care around contrast.

Surface fit 47/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 87/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #1B404F

For UI

For branding

For interior

For fashion

People also use #1B404F with

Pine Green Navy Espresso Platinum 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 11.1:1. Use

Subtle surface Use #C8DDE5 for cards and hover fills. Tint 80

Avoid beside #1B2F50 — 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 #1B404F 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: #1B404F;
  --color-base-rgb: 27 64 79;
  --color-base-oklch: oklch(35.1% 0.049 227.3);
  --color-50: #F3F9FB;
  --color-100: #E0EFF5;
  --color-200: #C2DFEA;
  --color-300: #98C5D7;
  --color-400: #70ABC2;
  --color-500: #4F8DA6;
  --color-600: #426E7F;
  --color-700: #34505B;
  --color-800: #25363C;
  --color-900: #182125;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F3F9FB',
    100: '#E0EFF5',
    200: '#C2DFEA',
    300: '#98C5D7',
    400: '#70ABC2',
    500: '#4F8DA6',
    600: '#426E7F',
    700: '#34505B',
    800: '#25363C',
    900: '#182125',
  },
}

$base: #1B404F;
$base-ink: #FFFFFF;
$base-50: #F3F9FB;
$base-100: #E0EFF5;
$base-200: #C2DFEA;
$base-300: #98C5D7;
$base-400: #70ABC2;
$base-500: #4F8DA6;
$base-600: #426E7F;
$base-700: #34505B;
$base-800: #25363C;
$base-900: #182125;
$base-hover: #163440;
$base-subtle: #ACCCD9;

{
    "color": {
        "base": {
            "value": "#1B404F",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F9FB",
                "type": "color"
            },
            "100": {
                "value": "#E0EFF5",
                "type": "color"
            },
            "200": {
                "value": "#C2DFEA",
                "type": "color"
            },
            "300": {
                "value": "#98C5D7",
                "type": "color"
            },
            "400": {
                "value": "#70ABC2",
                "type": "color"
            },
            "500": {
                "value": "#4F8DA6",
                "type": "color"
            },
            "600": {
                "value": "#426E7F",
                "type": "color"
            },
            "700": {
                "value": "#34505B",
                "type": "color"
            },
            "800": {
                "value": "#25363C",
                "type": "color"
            },
            "900": {
                "value": "#182125",
                "type": "color"
            }
        }
    }
}