What color is #1B375F?

#1B375F is a dark blue. In RGB it is rgb(27, 55, 95), and in HSL hsl(215, 56%, 24%).

Is #1B375F accessible as text?

On white, #1B375F has a contrast ratio of 11.94:1 (passes WCAG AA for body text); on black it is 1.76:1 (fails). For text placed on #1B375F, use white for the best readability.

What is the closest Tailwind color to #1B375F?

The nearest Tailwind CSS token is sky-950 (#052F4A).

What colors go well with #1B375F?

#1B375F pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #5F431B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1B375F below.

Is #1B375F good for buttons?

#1B375F works well for buttons and highlights, but use white text on #1B375F — black text only reaches 1.76:1, below the 4.5:1 needed for normal-size labels.

Is #1B375F the same as CSS midnightblue?

No — #1B375F is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#1B375F Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1B375F

Not just a swatch — here's how #1B375F works with other colors. Named schemes with #1B375F in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1B375F 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 #1B375F Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 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 #1B375F Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3E587E

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 #1B375F Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57223B

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 #1B375F Secondary #535E6D 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 #1B375F 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 32/100

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 40/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 30/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 45/100

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 #1B375F

For UI

For branding

For interior

For fashion

People also use #1B375F 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 11.9:1. Use

Subtle surface Use #C9D6E8 for cards and hover fills. Tint 80

Avoid beside #1B215F — 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 #1B375F 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: #1B375F;
  --color-base-rgb: 27 55 95;
  --color-base-oklch: oklch(33.7% 0.079 257.5);
  --color-50: #F3F7FC;
  --color-100: #DFE9F7;
  --color-200: #BFD2ED;
  --color-300: #93B2DC;
  --color-400: #6B91C7;
  --color-500: #4972AC;
  --color-600: #3E5B84;
  --color-700: #31445E;
  --color-800: #232E3E;
  --color-900: #171D26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F3F7FC',
    100: '#DFE9F7',
    200: '#BFD2ED',
    300: '#93B2DC',
    400: '#6B91C7',
    500: '#4972AC',
    600: '#3E5B84',
    700: '#31445E',
    800: '#232E3E',
    900: '#171D26',
  },
}

$base: #1B375F;
$base-ink: #FFFFFF;
$base-50: #F3F7FC;
$base-100: #DFE9F7;
$base-200: #BFD2ED;
$base-300: #93B2DC;
$base-400: #6B91C7;
$base-500: #4972AC;
$base-600: #3E5B84;
$base-700: #31445E;
$base-800: #232E3E;
$base-900: #171D26;
$base-hover: #162C4C;
$base-subtle: #ACC1DE;

{
    "color": {
        "base": {
            "value": "#1B375F",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F7FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE9F7",
                "type": "color"
            },
            "200": {
                "value": "#BFD2ED",
                "type": "color"
            },
            "300": {
                "value": "#93B2DC",
                "type": "color"
            },
            "400": {
                "value": "#6B91C7",
                "type": "color"
            },
            "500": {
                "value": "#4972AC",
                "type": "color"
            },
            "600": {
                "value": "#3E5B84",
                "type": "color"
            },
            "700": {
                "value": "#31445E",
                "type": "color"
            },
            "800": {
                "value": "#232E3E",
                "type": "color"
            },
            "900": {
                "value": "#171D26",
                "type": "color"
            }
        }
    }
}