What color is #03313F?

#03313F is a very dark, vivid cyan. In RGB it is rgb(3, 49, 63), and in HSL hsl(194, 91%, 13%).

Is #03313F accessible as text?

On white, #03313F has a contrast ratio of 13.86:1 (passes WCAG AA for body text); on black it is 1.51:1 (fails). For text placed on #03313F, use white for the best readability.

What is the closest Tailwind color to #03313F?

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

What colors go well with #03313F?

#03313F pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #3F1103. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #03313F below.

Is #03313F good for buttons?

#03313F works well for buttons and highlights, but use white text on #03313F — black text only reaches 1.51:1, below the 4.5:1 needed for normal-size labels.

Is #03313F the same as CSS darkslategray?

No — #03313F is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#03313F Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #03313F

Not just a swatch — here's how #03313F works with other colors. Named schemes with #03313F in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #03313F Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1E344A

Prussian 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 #03313F Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A5 Anchor #2E3236

Prussian 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 #03313F Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #2C505E

Prussian 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 Prussian Blue.

Vintage Leather Lead · 5 colors

Lead #03313F Secondary #6F5116 Surface #E2DCC0 Accent #385244 Anchor #56233E

Prussian 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 #03313F Secondary #465358 Support #969386 Ink #16140F

Prussian 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 Prussian Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #03313F 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 34/100

Cool

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

Softness 29/100

Low

Firm and assertive — carries weight and contrast.

Depth 68/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 70/100

High

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

Brand distinctiveness 20/100

Low

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

UI accent fit 27/100

Low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 50/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 86/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #03313F

For UI

For branding

For interior

For fashion

People also use #03313F with

Hunter Green Navy Oxblood Platinum Dark Slate Gray

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 13.9:1. Use

Subtle surface Use #B6E2F0 for cards and hover fills. Tint 80

Avoid beside #031D3F — 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 #03313F 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: #03313F;
  --color-base-rgb: 3 49 63;
  --color-base-oklch: oklch(29.2% 0.053 224.0);
  --color-50: #F0FBFE;
  --color-100: #D8F5FD;
  --color-200: #B1EAFB;
  --color-300: #7DD7F2;
  --color-400: #4EC1E4;
  --color-500: #2AA5CB;
  --color-600: #287F9A;
  --color-700: #235B6C;
  --color-800: #1B3C46;
  --color-900: #12252B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  prussian-blue: {
    50: '#F0FBFE',
    100: '#D8F5FD',
    200: '#B1EAFB',
    300: '#7DD7F2',
    400: '#4EC1E4',
    500: '#2AA5CB',
    600: '#287F9A',
    700: '#235B6C',
    800: '#1B3C46',
    900: '#12252B',
  },
}

$base: #03313F;
$base-ink: #FFFFFF;
$base-50: #F0FBFE;
$base-100: #D8F5FD;
$base-200: #B1EAFB;
$base-300: #7DD7F2;
$base-400: #4EC1E4;
$base-500: #2AA5CB;
$base-600: #287F9A;
$base-700: #235B6C;
$base-800: #1B3C46;
$base-900: #12252B;
$base-hover: #022733;
$base-subtle: #8ED5EA;

{
    "color": {
        "base": {
            "value": "#03313F",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FBFE",
                "type": "color"
            },
            "100": {
                "value": "#D8F5FD",
                "type": "color"
            },
            "200": {
                "value": "#B1EAFB",
                "type": "color"
            },
            "300": {
                "value": "#7DD7F2",
                "type": "color"
            },
            "400": {
                "value": "#4EC1E4",
                "type": "color"
            },
            "500": {
                "value": "#2AA5CB",
                "type": "color"
            },
            "600": {
                "value": "#287F9A",
                "type": "color"
            },
            "700": {
                "value": "#235B6C",
                "type": "color"
            },
            "800": {
                "value": "#1B3C46",
                "type": "color"
            },
            "900": {
                "value": "#12252B",
                "type": "color"
            }
        }
    }
}