What color is #03378B?

#03378B is a dark, vivid blue. In RGB it is rgb(3, 55, 139), and in HSL hsl(217, 96%, 28%).

Is #03378B accessible as text?

On white, #03378B has a contrast ratio of 10.92:1 (passes WCAG AA for body text); on black it is 1.92:1 (fails). For text placed on #03378B, use white for the best readability.

What is the closest Tailwind color to #03378B?

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

What colors go well with #03378B?

#03378B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8C5703. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #03378B below.

Is #03378B good for buttons?

#03378B works well for buttons and highlights, but use white text on #03378B — black text only reaches 1.92:1, below the 4.5:1 needed for normal-size labels.

Is #03378B the same as CSS darkslateblue?

No — #03378B is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#03378B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #03378B

Not just a swatch — here's how #03378B works with other colors. Named schemes with #03378B in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #03378B Anchor #141210 Accent #ADAE53 Secondary #232933 Surface #F0EEE3

Egyptian 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 #03378B Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #191550

Egyptian 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 Egyptian Blue.

Coastal Morning Lead · 5 colors

Lead #03378B Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Egyptian 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 #03378B Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Egyptian 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 #03378B Secondary #546683 Support #9D8F88 Ink #18140F

Egyptian 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 Egyptian Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #03378B 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 12/100

Cool

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

Softness 28/100

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 31/100

Low

A faint retro warmth without tipping into sepia.

Luxury 66/100

High

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

Brand distinctiveness 57/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 63/100

High

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

Surface fit 16/100

Very low

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

Print safety 71/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #03378B

For UI

For branding

For interior

For fashion

People also use #03378B with

Light Sea Green Phthalo Blue Russet 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 10.9:1. Use

Subtle surface Use #C1D4F4 for cards and hover fills. Tint 80

Avoid beside #030A8C — 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 #03378B 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: #03378B;
  --color-base-rgb: 3 55 139;
  --color-base-oklch: oklch(36.6% 0.149 260.5);
  --color-50: #F0F6FE;
  --color-100: #D8E6FD;
  --color-200: #B1CDFC;
  --color-300: #7AA9F6;
  --color-400: #4A86E8;
  --color-500: #2667CF;
  --color-600: #25539D;
  --color-700: #213E6E;
  --color-800: #192B48;
  --color-900: #121C2C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  egyptian-blue: {
    50: '#F0F6FE',
    100: '#D8E6FD',
    200: '#B1CDFC',
    300: '#7AA9F6',
    400: '#4A86E8',
    500: '#2667CF',
    600: '#25539D',
    700: '#213E6E',
    800: '#192B48',
    900: '#121C2C',
  },
}

$base: #03378B;
$base-ink: #FFFFFF;
$base-50: #F0F6FE;
$base-100: #D8E6FD;
$base-200: #B1CDFC;
$base-300: #7AA9F6;
$base-400: #4A86E8;
$base-500: #2667CF;
$base-600: #25539D;
$base-700: #213E6E;
$base-800: #192B48;
$base-900: #121C2C;
$base-hover: #022C70;
$base-subtle: #A0BFF0;

{
    "color": {
        "base": {
            "value": "#03378B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F6FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E6FD",
                "type": "color"
            },
            "200": {
                "value": "#B1CDFC",
                "type": "color"
            },
            "300": {
                "value": "#7AA9F6",
                "type": "color"
            },
            "400": {
                "value": "#4A86E8",
                "type": "color"
            },
            "500": {
                "value": "#2667CF",
                "type": "color"
            },
            "600": {
                "value": "#25539D",
                "type": "color"
            },
            "700": {
                "value": "#213E6E",
                "type": "color"
            },
            "800": {
                "value": "#192B48",
                "type": "color"
            },
            "900": {
                "value": "#121C2C",
                "type": "color"
            }
        }
    }
}

Palettes built on #03378B

Color Lab

Pairs with #03378B

UI roles & guardrails

In real applications

Scales

Every model

Export