What color is #2B403A?

#2B403A is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(43, 64, 58), and in HSL hsl(163, 20%, 21%).

Is #2B403A accessible as text?

On white, #2B403A has a contrast ratio of 11.07:1 (passes WCAG AA for body text); on black it is 1.90:1 (fails). For text placed on #2B403A, use white for the best readability.

What is the closest Tailwind color to #2B403A?

The nearest Tailwind CSS token is neutral-700 (#404040).

What colors go well with #2B403A?

As a neutral, #2B403A pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #2B403A the same as CSS darkslategray?

No — #2B403A is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#2B403A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2B403A

Not just a swatch — here's how #2B403A works with other colors. Named schemes with #2B403A in its natural role, and a note on why the supporting colors balance it.

Vintage Leather Lead · 5 colors

Lead #2B403A Secondary #734F19 Surface #E4DCC0 Accent #3B5141 Anchor #5B231F

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

Japanese Sand Base · 5 colors

Base #2B403A Surface #EDEADC Highlight #F5F1E7 Secondary #B5B19F Ink #2A2723

Onyx sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Luxury Packaging Feature · 5 colors

Feature #2B403A Anchor #141210 Accent #BCA84C Secondary #1F2C28 Surface #F1EDE3

Onyx carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors

Color #2B403A Anchor #292A2E Secondary #6D6F74 Surface #EBE7DA Accent #122020

Onyx adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Onyx.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #2B403A Secondary #5B6360 Support #989286 Ink #16140F

Onyx 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 Onyx carrying the quiet middle.

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Color Lab

How #2B403A 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 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 61/100

High

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

Naturalness 18/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 32/100

Low

A faint retro warmth without tipping into sepia.

Luxury 64/100

High

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

Brand distinctiveness 11/100

Very low

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

UI accent fit 35/100

Low

Workable accent with care around contrast.

Surface fit 53/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 94/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #2B403A

For UI

For branding

For interior

For fashion

People also use #2B403A with

Hunter Green Onyx Bistre 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 11.1:1. Use

Subtle surface Use #D1DDD9 for cards and hover fills. Tint 80

Avoid beside #2B3F40 — 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 #2B403A 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: #2B403A;
  --color-base-rgb: 43 64 58;
  --color-base-oklch: oklch(35.2% 0.029 174.9);
  --color-50: #F6F9F8;
  --color-100: #E6EFEC;
  --color-200: #CEDEDA;
  --color-300: #ABC5BD;
  --color-400: #88AAA0;
  --color-500: #698C82;
  --color-600: #546D66;
  --color-700: #3F4F4B;
  --color-800: #2C3533;
  --color-900: #1C2120;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F6F9F8',
    100: '#E6EFEC',
    200: '#CEDEDA',
    300: '#ABC5BD',
    400: '#88AAA0',
    500: '#698C82',
    600: '#546D66',
    700: '#3F4F4B',
    800: '#2C3533',
    900: '#1C2120',
  },
}

$base: #2B403A;
$base-ink: #FFFFFF;
$base-50: #F6F9F8;
$base-100: #E6EFEC;
$base-200: #CEDEDA;
$base-300: #ABC5BD;
$base-400: #88AAA0;
$base-500: #698C82;
$base-600: #546D66;
$base-700: #3F4F4B;
$base-800: #2C3533;
$base-900: #1C2120;
$base-hover: #22332F;
$base-subtle: #B9CCC7;

{
    "color": {
        "base": {
            "value": "#2B403A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F9F8",
                "type": "color"
            },
            "100": {
                "value": "#E6EFEC",
                "type": "color"
            },
            "200": {
                "value": "#CEDEDA",
                "type": "color"
            },
            "300": {
                "value": "#ABC5BD",
                "type": "color"
            },
            "400": {
                "value": "#88AAA0",
                "type": "color"
            },
            "500": {
                "value": "#698C82",
                "type": "color"
            },
            "600": {
                "value": "#546D66",
                "type": "color"
            },
            "700": {
                "value": "#3F4F4B",
                "type": "color"
            },
            "800": {
                "value": "#2C3533",
                "type": "color"
            },
            "900": {
                "value": "#1C2120",
                "type": "color"
            }
        }
    }
}