What color is #21591C?

#21591C is a dark green. In RGB it is rgb(33, 89, 28), and in HSL hsl(115, 52%, 23%).

Is #21591C accessible as text?

On white, #21591C has a contrast ratio of 8.37:1 (passes WCAG AA for body text); on black it is 2.51:1 (fails). For text placed on #21591C, use white for the best readability.

What is the closest Tailwind color to #21591C?

The nearest Tailwind CSS token is lime-900 (#35530E).

What colors go well with #21591C?

#21591C pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #541C59. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #21591C below.

Is #21591C good for buttons?

#21591C works well for buttons and highlights, but use white text on #21591C — black text only reaches 2.51:1, below the 4.5:1 needed for normal-size labels.

Is #21591C the same as CSS darkgreen?

No — #21591C is not the CSS named color darkgreen, but darkgreen (#006400) is the closest CSS named color.

#21591C Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #21591C

Not just a swatch — here's how #21591C works with other colors. Named schemes with #21591C in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #21591C Secondary #4D6B3B Accent #AE6B00 Surface #EEEAD6 Anchor #3C2F21

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 #21591C Secondary #754E1C 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 #21591C Anchor #392B1E Surface #EDE4D0 Accent #889B6D 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 #21591C Surface #F0E8D6 Anchor #61202A Accent #E6C3BA 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 #21591C Secondary #667863 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 #21591C 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 49/100

Neutral

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

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 59/100

Moderate

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 56/100

Moderate

Faded, nostalgic quality — editorial, heritage and retro work.

Luxury 65/100

High

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

Brand distinctiveness 30/100

Low

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

UI accent fit 76/100

High

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

Surface fit 25/100

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 #21591C

For UI

For branding

For interior

For fashion

People also use #21591C with

Fern Green Castleton 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 8.4:1. Use

Subtle surface Use #CBE6C9 for cards and hover fills. Tint 80

Avoid beside #1C592B — 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 #21591C 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: #21591C;
  --color-base-rgb: 33 89 28;
  --color-base-oklch: oklch(41.2% 0.110 142.0);
  --color-50: #F4FCF3;
  --color-100: #E1F6DF;
  --color-200: #C5EBC1;
  --color-300: #9CD996;
  --color-400: #75C46E;
  --color-500: #54A84D;
  --color-600: #468141;
  --color-700: #365C32;
  --color-800: #263D24;
  --color-900: #192618;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  castleton-green: {
    50: '#F4FCF3',
    100: '#E1F6DF',
    200: '#C5EBC1',
    300: '#9CD996',
    400: '#75C46E',
    500: '#54A84D',
    600: '#468141',
    700: '#365C32',
    800: '#263D24',
    900: '#192618',
  },
}

$base: #21591C;
$base-ink: #FFFFFF;
$base-50: #F4FCF3;
$base-100: #E1F6DF;
$base-200: #C5EBC1;
$base-300: #9CD996;
$base-400: #75C46E;
$base-500: #54A84D;
$base-600: #468141;
$base-700: #365C32;
$base-800: #263D24;
$base-900: #192618;
$base-hover: #1B4717;
$base-subtle: #B1DBAD;

{
    "color": {
        "base": {
            "value": "#21591C",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4FCF3",
                "type": "color"
            },
            "100": {
                "value": "#E1F6DF",
                "type": "color"
            },
            "200": {
                "value": "#C5EBC1",
                "type": "color"
            },
            "300": {
                "value": "#9CD996",
                "type": "color"
            },
            "400": {
                "value": "#75C46E",
                "type": "color"
            },
            "500": {
                "value": "#54A84D",
                "type": "color"
            },
            "600": {
                "value": "#468141",
                "type": "color"
            },
            "700": {
                "value": "#365C32",
                "type": "color"
            },
            "800": {
                "value": "#263D24",
                "type": "color"
            },
            "900": {
                "value": "#192618",
                "type": "color"
            }
        }
    }
}

Palettes built on #21591C

Color Lab

Pairs with #21591C

UI roles & guardrails

In real applications

Scales

Every model

Export