What color is #0A3138?

#0A3138 is a very dark, vivid cyan. In RGB it is rgb(10, 49, 56), and in HSL hsl(189, 70%, 13%).

Is #0A3138 accessible as text?

On white, #0A3138 has a contrast ratio of 13.91:1 (passes WCAG AA for body text); on black it is 1.51:1 (fails). For text placed on #0A3138, use white for the best readability.

What is the closest Tailwind color to #0A3138?

The nearest Tailwind CSS token is teal-950 (#022F2E).

What colors go well with #0A3138?

#0A3138 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #38110A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0A3138 below.

Is #0A3138 good for buttons?

#0A3138 works well for buttons and highlights, but use white text on #0A3138 — black text only reaches 1.51:1, below the 4.5:1 needed for normal-size labels.

Is #0A3138 the same as CSS darkslategray?

No — #0A3138 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#0A3138 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0A3138

Not just a swatch — here's how #0A3138 works with other colors. Named schemes with #0A3138 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #0A3138 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1E3549

Gunmetal Gray 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 #0A3138 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Gunmetal Gray 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 #0A3138 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #305057

Gunmetal Gray is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Gunmetal Gray.

Vintage Leather Lead · 5 colors

Lead #0A3138 Secondary #705117 Surface #E3DCC0 Accent #395143 Anchor #56233F

Gunmetal Gray 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 #0A3138 Secondary #475255 Support #979286 Ink #16140F

Gunmetal Gray 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 Gunmetal Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #0A3138 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 38/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 68/100

High

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

Naturalness 2/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 28/100

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 17/100

Very low

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

UI accent fit 25/100

Low

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

Surface fit 53/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 88/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #0A3138

For UI

For branding

For interior

For fashion

People also use #0A3138 with

Castleton 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 #BCE2E9 for cards and hover fills. Tint 80

Avoid beside #0A2238 — 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 #0A3138 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: #0A3138;
  --color-base-rgb: 10 49 56;
  --color-base-oklch: oklch(29.0% 0.044 212.1);
  --color-50: #F1FBFD;
  --color-100: #DBF5FA;
  --color-200: #BAEAF3;
  --color-300: #8AD7E5;
  --color-400: #5FC2D3;
  --color-500: #3DA6B8;
  --color-600: #357F8C;
  --color-700: #2B5B64;
  --color-800: #203C41;
  --color-900: #152528;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F1FBFD',
    100: '#DBF5FA',
    200: '#BAEAF3',
    300: '#8AD7E5',
    400: '#5FC2D3',
    500: '#3DA6B8',
    600: '#357F8C',
    700: '#2B5B64',
    800: '#203C41',
    900: '#152528',
  },
}

$base: #0A3138;
$base-ink: #FFFFFF;
$base-50: #F1FBFD;
$base-100: #DBF5FA;
$base-200: #BAEAF3;
$base-300: #8AD7E5;
$base-400: #5FC2D3;
$base-500: #3DA6B8;
$base-600: #357F8C;
$base-700: #2B5B64;
$base-800: #203C41;
$base-900: #152528;
$base-hover: #08282D;
$base-subtle: #99D5E0;

{
    "color": {
        "base": {
            "value": "#0A3138",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FBFD",
                "type": "color"
            },
            "100": {
                "value": "#DBF5FA",
                "type": "color"
            },
            "200": {
                "value": "#BAEAF3",
                "type": "color"
            },
            "300": {
                "value": "#8AD7E5",
                "type": "color"
            },
            "400": {
                "value": "#5FC2D3",
                "type": "color"
            },
            "500": {
                "value": "#3DA6B8",
                "type": "color"
            },
            "600": {
                "value": "#357F8C",
                "type": "color"
            },
            "700": {
                "value": "#2B5B64",
                "type": "color"
            },
            "800": {
                "value": "#203C41",
                "type": "color"
            },
            "900": {
                "value": "#152528",
                "type": "color"
            }
        }
    }
}