What color is #015121?

#015121 is a very dark, vivid green. In RGB it is rgb(1, 81, 33), and in HSL hsl(144, 98%, 16%).

Is #015121 accessible as text?

On white, #015121 has a contrast ratio of 9.54:1 (passes WCAG AA for body text); on black it is 2.20:1 (fails). For text placed on #015121, use white for the best readability.

What is the closest Tailwind color to #015121?

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

What colors go well with #015121?

#015121 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #510131. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #015121 below.

Is #015121 good for buttons?

#015121 works well for buttons and highlights, but use white text on #015121 — black text only reaches 2.20:1, below the 4.5:1 needed for normal-size labels.

Is #015121 the same as CSS darkgreen?

No — #015121 is not the CSS named color darkgreen, but darkgreen (#006400) is the closest CSS named color.

#015121 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #015121

Not just a swatch — here's how #015121 works with other colors. Named schemes with #015121 in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #015121 Secondary #4B6C3C 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 #015121 Secondary #754E1B Surface #E5DBC0 Accent #3C5140 Anchor #5B2321

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 #015121 Anchor #382B1E 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 #015121 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 #015121 Secondary #5A6F5E 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 #015121 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 45/100

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 28/100

Low

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

UI accent fit 64/100

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 #015121

For UI

For branding

For interior

For fashion

People also use #015121 with

Green Brunswick Green Deep 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 #B6F2CE for cards and hover fills. Tint 80

Avoid beside #01513B — 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 #015121 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: #015121;
  --color-base-rgb: 1 81 33;
  --color-base-oklch: oklch(38.0% 0.105 149.7);
  --color-50: #F0FEF6;
  --color-100: #D8FDE7;
  --color-200: #B1FCCF;
  --color-300: #78F7AB;
  --color-400: #48EA89;
  --color-500: #24D169;
  --color-600: #249E55;
  --color-700: #206F3F;
  --color-800: #19482C;
  --color-900: #112C1C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  castleton-green: {
    50: '#F0FEF6',
    100: '#D8FDE7',
    200: '#B1FCCF',
    300: '#78F7AB',
    400: '#48EA89',
    500: '#24D169',
    600: '#249E55',
    700: '#206F3F',
    800: '#19482C',
    900: '#112C1C',
  },
}

$base: #015121;
$base-ink: #FFFFFF;
$base-50: #F0FEF6;
$base-100: #D8FDE7;
$base-200: #B1FCCF;
$base-300: #78F7AB;
$base-400: #48EA89;
$base-500: #24D169;
$base-600: #249E55;
$base-700: #206F3F;
$base-800: #19482C;
$base-900: #112C1C;
$base-hover: #01411A;
$base-subtle: #8FEFB5;

{
    "color": {
        "base": {
            "value": "#015121",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FEF6",
                "type": "color"
            },
            "100": {
                "value": "#D8FDE7",
                "type": "color"
            },
            "200": {
                "value": "#B1FCCF",
                "type": "color"
            },
            "300": {
                "value": "#78F7AB",
                "type": "color"
            },
            "400": {
                "value": "#48EA89",
                "type": "color"
            },
            "500": {
                "value": "#24D169",
                "type": "color"
            },
            "600": {
                "value": "#249E55",
                "type": "color"
            },
            "700": {
                "value": "#206F3F",
                "type": "color"
            },
            "800": {
                "value": "#19482C",
                "type": "color"
            },
            "900": {
                "value": "#112C1C",
                "type": "color"
            }
        }
    }
}

Palettes built on #015121

Color Lab

Pairs with #015121

UI roles & guardrails

In real applications

Scales

Every model

Export