What color is #283C39?

#283C39 is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(40, 60, 57), and in HSL hsl(171, 20%, 20%).

Is #283C39 accessible as text?

On white, #283C39 has a contrast ratio of 11.69:1 (passes WCAG AA for body text); on black it is 1.80:1 (fails). For text placed on #283C39, use white for the best readability.

What is the closest Tailwind color to #283C39?

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

What colors go well with #283C39?

As a neutral, #283C39 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 #283C39 the same as CSS darkslategray?

No — #283C39 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.

#283C39 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #283C39

Not just a swatch — here's how #283C39 works with other colors. Named schemes with #283C39 in its natural role, and a note on why the supporting colors balance it.

Vintage Leather Lead · 5 colors

Lead #283C39 Secondary #725018 Surface #E4DCC0 Accent #3A5142 Anchor #5B241E

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 #283C39 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 #283C39 Anchor #141210 Accent #BAA94D Secondary #1E2C2A 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 #283C39 Anchor #292A2E Secondary #6D6E74 Surface #EAE7DA Accent #101D1E

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 #283C39 Secondary #585F5E Support #979286 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 #283C39 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 36/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

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

Naturalness 11/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 30/100

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 10/100

Very low

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

UI accent fit 31/100

Low

Workable accent with care around contrast.

Surface fit 55/100

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 #283C39

For UI

For branding

For interior

For fashion

People also use #283C39 with

Hunter Green Gunmetal Gray 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 11.7:1. Use

Subtle surface Use #D0DCDA for cards and hover fills. Tint 80

Avoid beside #29393D — 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 #283C39 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: #283C39;
  --color-base-rgb: 40 60 57;
  --color-base-oklch: oklch(33.8% 0.026 184.5);
  --color-50: #F6F9F9;
  --color-100: #E6EFEE;
  --color-200: #CEDEDC;
  --color-300: #ABC5C1;
  --color-400: #88AAA5;
  --color-500: #698C87;
  --color-600: #546D6A;
  --color-700: #3F4F4D;
  --color-800: #2C3534;
  --color-900: #1C2120;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F6F9F9',
    100: '#E6EFEE',
    200: '#CEDEDC',
    300: '#ABC5C1',
    400: '#88AAA5',
    500: '#698C87',
    600: '#546D6A',
    700: '#3F4F4D',
    800: '#2C3534',
    900: '#1C2120',
  },
}

$base: #283C39;
$base-ink: #FFFFFF;
$base-50: #F6F9F9;
$base-100: #E6EFEE;
$base-200: #CEDEDC;
$base-300: #ABC5C1;
$base-400: #88AAA5;
$base-500: #698C87;
$base-600: #546D6A;
$base-700: #3F4F4D;
$base-800: #2C3534;
$base-900: #1C2120;
$base-hover: #21312F;
$base-subtle: #B8CBC8;

{
    "color": {
        "base": {
            "value": "#283C39",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F9F9",
                "type": "color"
            },
            "100": {
                "value": "#E6EFEE",
                "type": "color"
            },
            "200": {
                "value": "#CEDEDC",
                "type": "color"
            },
            "300": {
                "value": "#ABC5C1",
                "type": "color"
            },
            "400": {
                "value": "#88AAA5",
                "type": "color"
            },
            "500": {
                "value": "#698C87",
                "type": "color"
            },
            "600": {
                "value": "#546D6A",
                "type": "color"
            },
            "700": {
                "value": "#3F4F4D",
                "type": "color"
            },
            "800": {
                "value": "#2C3534",
                "type": "color"
            },
            "900": {
                "value": "#1C2120",
                "type": "color"
            }
        }
    }
}