What color is #033B5D?

#033B5D is a dark, vivid cyan-blue. In RGB it is rgb(3, 59, 93), and in HSL hsl(203, 94%, 19%).

Is #033B5D accessible as text?

On white, #033B5D has a contrast ratio of 11.75:1 (passes WCAG AA for body text); on black it is 1.79:1 (fails). For text placed on #033B5D, use white for the best readability.

What is the closest Tailwind color to #033B5D?

The nearest Tailwind CSS token is cyan-950 (#053345).

What colors go well with #033B5D?

#033B5D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #5E2603. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #033B5D below.

Is #033B5D good for buttons?

#033B5D works well for buttons and highlights, but use white text on #033B5D — black text only reaches 1.79:1, below the 4.5:1 needed for normal-size labels.

Is #033B5D the same as CSS darkslategray?

No — #033B5D is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#033B5D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #033B5D

Not just a swatch — here's how #033B5D works with other colors. Named schemes with #033B5D in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #033B5D Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A0 Anchor #1F344A

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 #033B5D Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 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 #033B5D Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #315C7C

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 #033B5D Secondary #7F4438 Surface #E2DDC0 Accent #375245 Anchor #57233C

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 #033B5D Secondary #505F6C Support #969386 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 #033B5D 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 27/100

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 39/100

Low

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 31/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 46/100

Moderate

Workable accent with care around contrast.

Surface fit 39/100

Low

Usable as a tinted surface in measured doses.

Print safety 81/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #033B5D

For UI

For branding

For interior

For fashion

People also use #033B5D with

Viridian 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 11.7:1. Use

Subtle surface Use #BADCF2 for cards and hover fills. Tint 80

Avoid beside #031D5E — 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 #033B5D 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: #033B5D;
  --color-base-rgb: 3 59 93;
  --color-base-oklch: oklch(33.8% 0.080 243.0);
  --color-50: #F0F9FE;
  --color-100: #D8EFFD;
  --color-200: #B1DFFC;
  --color-300: #7BC6F4;
  --color-400: #4BABE7;
  --color-500: #288ECD;
  --color-600: #266F9B;
  --color-700: #21506D;
  --color-800: #1A3647;
  --color-900: #12222B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F0F9FE',
    100: '#D8EFFD',
    200: '#B1DFFC',
    300: '#7BC6F4',
    400: '#4BABE7',
    500: '#288ECD',
    600: '#266F9B',
    700: '#21506D',
    800: '#1A3647',
    900: '#12222B',
  },
}

$base: #033B5D;
$base-ink: #FFFFFF;
$base-50: #F0F9FE;
$base-100: #D8EFFD;
$base-200: #B1DFFC;
$base-300: #7BC6F4;
$base-400: #4BABE7;
$base-500: #288ECD;
$base-600: #266F9B;
$base-700: #21506D;
$base-800: #1A3647;
$base-900: #12222B;
$base-hover: #022F4B;
$base-subtle: #95CBED;

{
    "color": {
        "base": {
            "value": "#033B5D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F9FE",
                "type": "color"
            },
            "100": {
                "value": "#D8EFFD",
                "type": "color"
            },
            "200": {
                "value": "#B1DFFC",
                "type": "color"
            },
            "300": {
                "value": "#7BC6F4",
                "type": "color"
            },
            "400": {
                "value": "#4BABE7",
                "type": "color"
            },
            "500": {
                "value": "#288ECD",
                "type": "color"
            },
            "600": {
                "value": "#266F9B",
                "type": "color"
            },
            "700": {
                "value": "#21506D",
                "type": "color"
            },
            "800": {
                "value": "#1A3647",
                "type": "color"
            },
            "900": {
                "value": "#12222B",
                "type": "color"
            }
        }
    }
}