What color is #303B38?

#303B38 is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(48, 59, 56), and in HSL hsl(164, 10%, 21%).

Is #303B38 accessible as text?

On white, #303B38 has a contrast ratio of 11.61:1 (passes WCAG AA for body text); on black it is 1.81:1 (fails). For text placed on #303B38, use white for the best readability.

What is the closest Tailwind color to #303B38?

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

What colors go well with #303B38?

As a neutral, #303B38 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 #303B38 the same as CSS darkslategray?

No — #303B38 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.

#303B38 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #303B38

Not just a swatch — here's how #303B38 works with other colors. Named schemes with #303B38 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #303B38 Surface #14161A Highlight #F4F6F8 Secondary #586771 Accent #515B58

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 #303B38 Secondary #734F19 Surface #E4DCC0 Accent #3B5141 Anchor #5B231E

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 #303B38 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 #303B38 Anchor #141210 Accent #BBA84C Secondary #1E2C29 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 #303B38 Secondary #5B5F5E 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 #303B38 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 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 61/100

High

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

Naturalness 12/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 28/100

Low

A faint retro warmth without tipping into sepia.

Luxury 63/100

High

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

Brand distinctiveness 6/100

Very low

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

UI accent fit 29/100

Low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 58/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 97/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #303B38

For UI

For branding

For interior

For fashion

People also use #303B38 with

Outer Space Onyx Platinum

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 11.6:1. Use

Subtle surface Use #D4DAD8 for cards and hover fills. Tint 80

Avoid beside #303A3B — 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 #303B38 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: #303B38;
  --color-base-rgb: 48 59 56;
  --color-base-oklch: oklch(34.1% 0.016 177.0);
  --color-50: #F7F8F8;
  --color-100: #E8EDEC;
  --color-200: #D2DAD8;
  --color-300: #B1BEBB;
  --color-400: #91A19D;
  --color-500: #72837F;
  --color-600: #5B6764;
  --color-700: #434B49;
  --color-800: #2E3332;
  --color-900: #1D201F;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F7F8F8',
    100: '#E8EDEC',
    200: '#D2DAD8',
    300: '#B1BEBB',
    400: '#91A19D',
    500: '#72837F',
    600: '#5B6764',
    700: '#434B49',
    800: '#2E3332',
    900: '#1D201F',
  },
}

$base: #303B38;
$base-ink: #FFFFFF;
$base-50: #F7F8F8;
$base-100: #E8EDEC;
$base-200: #D2DAD8;
$base-300: #B1BEBB;
$base-400: #91A19D;
$base-500: #72837F;
$base-600: #5B6764;
$base-700: #434B49;
$base-800: #2E3332;
$base-900: #1D201F;
$base-hover: #272F2D;
$base-subtle: #BEC7C5;

{
    "color": {
        "base": {
            "value": "#303B38",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F7F8F8",
                "type": "color"
            },
            "100": {
                "value": "#E8EDEC",
                "type": "color"
            },
            "200": {
                "value": "#D2DAD8",
                "type": "color"
            },
            "300": {
                "value": "#B1BEBB",
                "type": "color"
            },
            "400": {
                "value": "#91A19D",
                "type": "color"
            },
            "500": {
                "value": "#72837F",
                "type": "color"
            },
            "600": {
                "value": "#5B6764",
                "type": "color"
            },
            "700": {
                "value": "#434B49",
                "type": "color"
            },
            "800": {
                "value": "#2E3332",
                "type": "color"
            },
            "900": {
                "value": "#1D201F",
                "type": "color"
            }
        }
    }
}