What color is #33403B?

#33403B is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(51, 64, 59), and in HSL hsl(157, 11%, 23%).

Is #33403B accessible as text?

On white, #33403B has a contrast ratio of 10.84:1 (passes WCAG AA for body text); on black it is 1.94:1 (fails). For text placed on #33403B, use white for the best readability.

What is the closest Tailwind color to #33403B?

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

What colors go well with #33403B?

As a neutral, #33403B 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 #33403B the same as CSS darkslategray?

No — #33403B 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.

#33403B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #33403B

Not just a swatch — here's how #33403B works with other colors. Named schemes with #33403B in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #33403B Surface #14161A Highlight #F4F6F8 Secondary #586771 Accent #54605B

Onyx is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Onyx.

Vintage Leather Lead · 5 colors

Lead #33403B Secondary #734F19 Surface #E5DBC0 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 #33403B Surface #EDEADC Highlight #F5F1E7 Secondary #B5B09F 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 #33403B Anchor #141210 Accent #BCA84C Secondary #1F2C27 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.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #33403B Secondary #5F6462 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 #33403B 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 47/100

Neutral

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 60/100

Moderate

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

Naturalness 18/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 31/100

Low

A faint retro warmth without tipping into sepia.

Luxury 62/100

High

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

Brand distinctiveness 7/100

Very low

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

UI accent fit 33/100

Low

Workable accent with care around contrast.

Surface fit 56/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 96/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #33403B

For UI

For branding

For interior

For fashion

People also use #33403B with

Feldgrau Onyx Platinum Outer Space

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 10.8:1. Use

Subtle surface Use #D5DBD8 for cards and hover fills. Tint 80

Avoid beside #344140 — 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 #33403B 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: #33403B;
  --color-base-rgb: 51 64 59;
  --color-base-oklch: oklch(35.8% 0.019 169.9);
  --color-50: #F6F8F8;
  --color-100: #E8EDEB;
  --color-200: #D2DBD7;
  --color-300: #B1BFB9;
  --color-400: #90A29B;
  --color-500: #71847D;
  --color-600: #5A6862;
  --color-700: #434C48;
  --color-800: #2E3331;
  --color-900: #1D201F;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F6F8F8',
    100: '#E8EDEB',
    200: '#D2DBD7',
    300: '#B1BFB9',
    400: '#90A29B',
    500: '#71847D',
    600: '#5A6862',
    700: '#434C48',
    800: '#2E3331',
    900: '#1D201F',
  },
}

$base: #33403B;
$base-ink: #FFFFFF;
$base-50: #F6F8F8;
$base-100: #E8EDEB;
$base-200: #D2DBD7;
$base-300: #B1BFB9;
$base-400: #90A29B;
$base-500: #71847D;
$base-600: #5A6862;
$base-700: #434C48;
$base-800: #2E3331;
$base-900: #1D201F;
$base-hover: #2A3430;
$base-subtle: #BFC9C5;

{
    "color": {
        "base": {
            "value": "#33403B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F8F8",
                "type": "color"
            },
            "100": {
                "value": "#E8EDEB",
                "type": "color"
            },
            "200": {
                "value": "#D2DBD7",
                "type": "color"
            },
            "300": {
                "value": "#B1BFB9",
                "type": "color"
            },
            "400": {
                "value": "#90A29B",
                "type": "color"
            },
            "500": {
                "value": "#71847D",
                "type": "color"
            },
            "600": {
                "value": "#5A6862",
                "type": "color"
            },
            "700": {
                "value": "#434C48",
                "type": "color"
            },
            "800": {
                "value": "#2E3331",
                "type": "color"
            },
            "900": {
                "value": "#1D201F",
                "type": "color"
            }
        }
    }
}