What color is #033EAB?

#033EAB is a dark, vivid blue. In RGB it is rgb(3, 62, 171), and in HSL hsl(219, 97%, 34%).

Is #033EAB accessible as text?

On white, #033EAB has a contrast ratio of 9.21:1 (passes WCAG AA for body text); on black it is 2.28:1 (fails). For text placed on #033EAB, use white for the best readability.

What is the closest Tailwind color to #033EAB?

The nearest Tailwind CSS token is blue-800 (#193CB8).

What colors go well with #033EAB?

#033EAB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #AB7003. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #033EAB below.

Is #033EAB good for buttons?

#033EAB works well for buttons and highlights, but use white text on #033EAB — black text only reaches 2.28:1, below the 4.5:1 needed for normal-size labels.

Is #033EAB the same as CSS darkslateblue?

No — #033EAB is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#033EAB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #033EAB

Not just a swatch — here's how #033EAB works with other colors. Named schemes with #033EAB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #033EAB Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cobalt 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 #033EAB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3266C9

Cobalt 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 Cobalt Blue.

Vintage Leather Lead · 5 colors

Lead #033EAB Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Cobalt 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 #033EAB Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Cobalt 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 #033EAB Secondary #5D7298 Support #9D8F88 Ink #18140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #033EAB 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 8/100

Cool

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

Softness 28/100

Low

Firm and assertive — carries weight and contrast.

Depth 62/100

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 25/100

Low

Clean and current — no dusty, aged cast.

Luxury 60/100

Moderate

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

Brand distinctiveness 49/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 73/100

High

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

Surface fit 13/100

Very low

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

Print safety 65/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #033EAB

For UI

For branding

For interior

For fashion

People also use #033EAB with

Lagoon Blue Zaffre 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 9.2:1. Use

Subtle surface Use #C6D6F5 for cards and hover fills. Tint 80

Avoid beside #0305AB — 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 #033EAB 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: #033EAB;
  --color-base-rgb: 3 62 171;
  --color-base-oklch: oklch(41.1% 0.183 261.8);
  --color-50: #F0F5FE;
  --color-100: #D8E5FD;
  --color-200: #B1CBFC;
  --color-300: #79A5F6;
  --color-400: #4981E9;
  --color-500: #2561D0;
  --color-600: #254F9D;
  --color-700: #203C6F;
  --color-800: #192948;
  --color-900: #111B2C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F0F5FE',
    100: '#D8E5FD',
    200: '#B1CBFC',
    300: '#79A5F6',
    400: '#4981E9',
    500: '#2561D0',
    600: '#254F9D',
    700: '#203C6F',
    800: '#192948',
    900: '#111B2C',
  },
}

$base: #033EAB;
$base-ink: #FFFFFF;
$base-50: #F0F5FE;
$base-100: #D8E5FD;
$base-200: #B1CBFC;
$base-300: #79A5F6;
$base-400: #4981E9;
$base-500: #2561D0;
$base-600: #254F9D;
$base-700: #203C6F;
$base-800: #192948;
$base-900: #111B2C;
$base-hover: #023189;
$base-subtle: #A7C1F2;

{
    "color": {
        "base": {
            "value": "#033EAB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F5FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E5FD",
                "type": "color"
            },
            "200": {
                "value": "#B1CBFC",
                "type": "color"
            },
            "300": {
                "value": "#79A5F6",
                "type": "color"
            },
            "400": {
                "value": "#4981E9",
                "type": "color"
            },
            "500": {
                "value": "#2561D0",
                "type": "color"
            },
            "600": {
                "value": "#254F9D",
                "type": "color"
            },
            "700": {
                "value": "#203C6F",
                "type": "color"
            },
            "800": {
                "value": "#192948",
                "type": "color"
            },
            "900": {
                "value": "#111B2C",
                "type": "color"
            }
        }
    }
}

Palettes built on #033EAB

Color Lab

Pairs with #033EAB

UI roles & guardrails

In real applications

Scales

Every model

Export