What color is #0A511D?

#0A511D is a dark, vivid green. In RGB it is rgb(10, 81, 29), and in HSL hsl(136, 78%, 18%).

Is #0A511D accessible as text?

On white, #0A511D has a contrast ratio of 9.51:1 (passes WCAG AA for body text); on black it is 2.21:1 (fails). For text placed on #0A511D, use white for the best readability.

What is the closest Tailwind color to #0A511D?

The nearest Tailwind CSS token is green-900 (#0D542B).

What colors go well with #0A511D?

#0A511D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #520A3F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0A511D below.

Is #0A511D good for buttons?

#0A511D works well for buttons and highlights, but use white text on #0A511D — black text only reaches 2.21:1, below the 4.5:1 needed for normal-size labels.

Is #0A511D the same as CSS darkgreen?

No — #0A511D is not the CSS named color darkgreen, but darkgreen (#006400) is the closest CSS named color.

#0A511D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0A511D

Not just a swatch — here's how #0A511D works with other colors. Named schemes with #0A511D in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #0A511D Secondary #4C6B3C Accent #AD6C00 Surface #EEEAD6 Anchor #3C2F20

Castleton Green leads this botanical set among foliage greens and a terracotta accent, softened by cream and grounded in bark brown.

Vintage Leather Lead · 5 colors

Lead #0A511D Secondary #754E1B Surface #E6DBC0 Accent #3C5140 Anchor #5B2322

Castleton Green plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Modern Café Dominant · 5 colors

Dominant #0A511D Anchor #392B1E Surface #EDE4D0 Accent #879B6D Secondary #3A3833

Castleton Green anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Berry & Cream Lead · 5 colors

Lead #0A511D Surface #F0E8D6 Anchor #612029 Accent #E5C3BA Secondary #342B2C

Castleton Green sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #0A511D Secondary #5B6F5D Support #989286 Ink #17140F

Castleton Green 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 Castleton Green carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #0A511D 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 46/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

Mid depth — usable as an accent or a muted ground.

Naturalness 100/100

Very high

Organic, earthy character — at home in wellness, food and craft brands.

Vintage feel 52/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 29/100

Low

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

UI accent fit 65/100

High

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

Surface fit 28/100

Low

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

Print safety 77/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #0A511D

For UI

For branding

For interior

For fashion

People also use #0A511D with

Green Brunswick Green Tyrian Purple Platinum Hunter Green

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 9.5:1. Use

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

Avoid beside #0A5235 — 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 #0A511D at work across the surfaces designers actually ship.

Website / UI

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Build faster.

A working theme, generated in seconds.

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: #0A511D;
  --color-base-rgb: 10 81 29;
  --color-base-oklch: oklch(38.1% 0.106 147.1);
  --color-50: #F1FEF4;
  --color-100: #DAFBE3;
  --color-200: #B6F6C7;
  --color-300: #85EAA0;
  --color-400: #58DA7B;
  --color-500: #36BF5A;
  --color-600: #30914A;
  --color-700: #286739;
  --color-800: #1E4328;
  --color-900: #14291A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  castleton-green: {
    50: '#F1FEF4',
    100: '#DAFBE3',
    200: '#B6F6C7',
    300: '#85EAA0',
    400: '#58DA7B',
    500: '#36BF5A',
    600: '#30914A',
    700: '#286739',
    800: '#1E4328',
    900: '#14291A',
  },
}

$base: #0A511D;
$base-ink: #FFFFFF;
$base-50: #F1FEF4;
$base-100: #DAFBE3;
$base-200: #B6F6C7;
$base-300: #85EAA0;
$base-400: #58DA7B;
$base-500: #36BF5A;
$base-600: #30914A;
$base-700: #286739;
$base-800: #1E4328;
$base-900: #14291A;
$base-hover: #084117;
$base-subtle: #9BE5AF;

{
    "color": {
        "base": {
            "value": "#0A511D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FEF4",
                "type": "color"
            },
            "100": {
                "value": "#DAFBE3",
                "type": "color"
            },
            "200": {
                "value": "#B6F6C7",
                "type": "color"
            },
            "300": {
                "value": "#85EAA0",
                "type": "color"
            },
            "400": {
                "value": "#58DA7B",
                "type": "color"
            },
            "500": {
                "value": "#36BF5A",
                "type": "color"
            },
            "600": {
                "value": "#30914A",
                "type": "color"
            },
            "700": {
                "value": "#286739",
                "type": "color"
            },
            "800": {
                "value": "#1E4328",
                "type": "color"
            },
            "900": {
                "value": "#14291A",
                "type": "color"
            }
        }
    }
}

Palettes built on #0A511D

Color Lab

Pairs with #0A511D

UI roles & guardrails

In real applications

Scales

Every model

Export