What color is #09511B?

#09511B is a dark, vivid green. In RGB it is rgb(9, 81, 27), and in HSL hsl(135, 80%, 18%).

Is #09511B accessible as text?

On white, #09511B has a contrast ratio of 9.53:1 (passes WCAG AA for body text); on black it is 2.20:1 (fails). For text placed on #09511B, use white for the best readability.

What is the closest Tailwind color to #09511B?

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

What colors go well with #09511B?

#09511B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #530940. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #09511B below.

Is #09511B good for buttons?

#09511B works well for buttons and highlights, but use white text on #09511B — black text only reaches 2.20:1, below the 4.5:1 needed for normal-size labels.

Is #09511B the same as CSS darkgreen?

No — #09511B is not the CSS named color darkgreen, but darkgreen (#006400) is the closest CSS named color.

#09511B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #09511B

Not just a swatch — here's how #09511B works with other colors. Named schemes with #09511B in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #09511B 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 #09511B 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 #09511B 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 #09511B 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 #09511B Secondary #5B6F5C 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.

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Color Lab

How #09511B 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

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

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 27/100

Low

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

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #09511B

For UI

For branding

For interior

For fashion

People also use #09511B 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 #BDEDC9 for cards and hover fills. Tint 80

Avoid beside #095334 — 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 #09511B 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: #09511B;
  --color-base-rgb: 9 81 27;
  --color-base-oklch: oklch(38.1% 0.108 146.6);
  --color-50: #F1FEF4;
  --color-100: #D9FCE2;
  --color-200: #B6F7C6;
  --color-300: #84EB9E;
  --color-400: #57DB78;
  --color-500: #34C157;
  --color-600: #2F9348;
  --color-700: #276837;
  --color-800: #1D4427;
  --color-900: #142919;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  castleton-green: {
    50: '#F1FEF4',
    100: '#D9FCE2',
    200: '#B6F7C6',
    300: '#84EB9E',
    400: '#57DB78',
    500: '#34C157',
    600: '#2F9348',
    700: '#276837',
    800: '#1D4427',
    900: '#142919',
  },
}

$base: #09511B;
$base-ink: #FFFFFF;
$base-50: #F1FEF4;
$base-100: #D9FCE2;
$base-200: #B6F7C6;
$base-300: #84EB9E;
$base-400: #57DB78;
$base-500: #34C157;
$base-600: #2F9348;
$base-700: #276837;
$base-800: #1D4427;
$base-900: #142919;
$base-hover: #074216;
$base-subtle: #9AE6AD;

{
    "color": {
        "base": {
            "value": "#09511B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FEF4",
                "type": "color"
            },
            "100": {
                "value": "#D9FCE2",
                "type": "color"
            },
            "200": {
                "value": "#B6F7C6",
                "type": "color"
            },
            "300": {
                "value": "#84EB9E",
                "type": "color"
            },
            "400": {
                "value": "#57DB78",
                "type": "color"
            },
            "500": {
                "value": "#34C157",
                "type": "color"
            },
            "600": {
                "value": "#2F9348",
                "type": "color"
            },
            "700": {
                "value": "#276837",
                "type": "color"
            },
            "800": {
                "value": "#1D4427",
                "type": "color"
            },
            "900": {
                "value": "#142919",
                "type": "color"
            }
        }
    }
}

Palettes built on #09511B

Color Lab

Pairs with #09511B

UI roles & guardrails

In real applications

Scales

Every model

Export