What color is #374C8A?

#374C8A is a dark blue. In RGB it is rgb(55, 76, 138), and in HSL hsl(225, 43%, 38%).

Is #374C8A accessible as text?

On white, #374C8A has a contrast ratio of 8.19:1 (passes WCAG AA for body text); on black it is 2.56:1 (fails). For text placed on #374C8A, use white for the best readability.

What is the closest Tailwind color to #374C8A?

The nearest Tailwind CSS token is sky-800 (#00598A).

What colors go well with #374C8A?

#374C8A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8B7637. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #374C8A below.

Is #374C8A good for buttons?

#374C8A works well for buttons and highlights, but use white text on #374C8A — black text only reaches 2.56:1, below the 4.5:1 needed for normal-size labels.

Is #374C8A the same as CSS darkslateblue?

No — #374C8A is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#374C8A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #374C8A

Not just a swatch — here's how #374C8A works with other colors. Named schemes with #374C8A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #374C8A Accent #A5C4C2 Surface #EAD5C0 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.

Tech Product Signal · 5 colors

Signal #374C8A Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5A6FAA

Classic 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 Classic Blue.

Vintage Leather Lead · 5 colors

Lead #374C8A Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #58223A

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.

Berry & Cream Lead · 5 colors

Lead #374C8A Surface #F6E5D8 Anchor #5B2143 Accent #E5C2CA Secondary #322B2F

Classic Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #374C8A Secondary #6E788E 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 #374C8A 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 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 57/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 48/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 63/100

High

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

Brand distinctiveness 29/100

Low

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

UI accent fit 81/100

Very high

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

Surface fit 25/100

Low

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

Print safety 81/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #374C8A

For UI

For branding

For interior

For fashion

People also use #374C8A with

Bondi Blue Dark Slate Blue Olive Brown 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 8.2:1. Use

Subtle surface Use #D6DAE9 for cards and hover fills. Tint 80

Avoid beside #3E378B — 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 #374C8A 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: #374C8A;
  --color-base-rgb: 55 76 138;
  --color-base-oklch: oklch(43.2% 0.106 267.7);
  --color-50: #F4F6FB;
  --color-100: #E1E6F4;
  --color-200: #C5CDE8;
  --color-300: #9CAAD3;
  --color-400: #7587BD;
  --color-500: #5567A0;
  --color-600: #46547C;
  --color-700: #363F59;
  --color-800: #262B3B;
  --color-900: #191C24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F4F6FB',
    100: '#E1E6F4',
    200: '#C5CDE8',
    300: '#9CAAD3',
    400: '#7587BD',
    500: '#5567A0',
    600: '#46547C',
    700: '#363F59',
    800: '#262B3B',
    900: '#191C24',
  },
}

$base: #374C8A;
$base-ink: #FFFFFF;
$base-50: #F4F6FB;
$base-100: #E1E6F4;
$base-200: #C5CDE8;
$base-300: #9CAAD3;
$base-400: #7587BD;
$base-500: #5567A0;
$base-600: #46547C;
$base-700: #363F59;
$base-800: #262B3B;
$base-900: #191C24;
$base-hover: #2C3D6F;
$base-subtle: #C0C8DF;

{
    "color": {
        "base": {
            "value": "#374C8A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F6FB",
                "type": "color"
            },
            "100": {
                "value": "#E1E6F4",
                "type": "color"
            },
            "200": {
                "value": "#C5CDE8",
                "type": "color"
            },
            "300": {
                "value": "#9CAAD3",
                "type": "color"
            },
            "400": {
                "value": "#7587BD",
                "type": "color"
            },
            "500": {
                "value": "#5567A0",
                "type": "color"
            },
            "600": {
                "value": "#46547C",
                "type": "color"
            },
            "700": {
                "value": "#363F59",
                "type": "color"
            },
            "800": {
                "value": "#262B3B",
                "type": "color"
            },
            "900": {
                "value": "#191C24",
                "type": "color"
            }
        }
    }
}