What color is #100308?

#100308 is a very dark low-chroma warm gray with a subtle warm cast. In RGB it is rgb(16, 3, 8), and in HSL hsl(337, 68%, 4%).

Is #100308 accessible as text?

On white, #100308 has a contrast ratio of 20.22:1 (passes WCAG AA for body text); on black it is 1.04:1 (fails). For text placed on #100308, use white for the best readability.

What is the closest Tailwind color to #100308?

The nearest Tailwind CSS token is zinc-950 (#09090B).

What colors go well with #100308?

As a neutral, #100308 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 #100308 the same as CSS black?

No — #100308 is not the CSS named color black, but black (#000000) is the closest CSS named color.

#100308 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #100308

Not just a swatch — here's how #100308 works with other colors. Named schemes with #100308 in its natural role, and a note on why the supporting colors balance it.

Vintage Leather Lead · 5 colors

Lead #100308 Secondary #7D482B Surface #EBD9C1 Accent #454F39 Anchor #5A2231

Jet Black 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 #100308 Surface #F1E8DC Highlight #F7F1E7 Secondary #BCAEA0 Ink #2B2723

Jet Black 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 #100308 Anchor #141210 Accent #D49C50 Secondary #31252A Surface #F3EDE3

Jet Black 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 #100308 Secondary #2B2427 Support #9C9087 Ink #17140F

Jet Black 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 Jet Black carrying the quiet middle.

Berry & Cream Lead · 5 colors

Lead #100308 Surface #F4E6D7 Anchor #5E203A Accent #E6C2C4 Secondary #332B2E

Jet Black sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

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Color Lab

How #100308 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 55/100

Neutral

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

Softness 15/100

Very low

Firm and assertive — carries weight and contrast.

Depth 82/100

Very high

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

Naturalness 8/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 23/100

Low

Clean and current — no dusty, aged cast.

Luxury 81/100

Very high

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

Brand distinctiveness 12/100

Very low

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

UI accent fit 4/100

Very low

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

Surface fit 67/100

High

Calm enough for large fills — backgrounds, cards, sections.

Print safety 97/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #100308

For UI

For branding

For interior

For fashion

People also use #100308 with

Deep Purple Jet Black Gainsboro Taupe

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 20.2:1. Use

Subtle surface Use #E6B6C8 for cards and hover fills. Tint 80

Avoid beside #110304 — 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 #100308 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: #100308;
  --color-base-rgb: 16 3 8;
  --color-base-oklch: oklch(12.9% 0.031 352.7);
  --color-50: #FDF2F6;
  --color-100: #F9DCE7;
  --color-200: #F2BBD0;
  --color-300: #E38CAD;
  --color-400: #D1618C;
  --color-500: #B63F6C;
  --color-600: #8B3757;
  --color-700: #632C41;
  --color-800: #41202D;
  --color-900: #28151C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#FDF2F6',
    100: '#F9DCE7',
    200: '#F2BBD0',
    300: '#E38CAD',
    400: '#D1618C',
    500: '#B63F6C',
    600: '#8B3757',
    700: '#632C41',
    800: '#41202D',
    900: '#28151C',
  },
}

$base: #100308;
$base-ink: #FFFFFF;
$base-50: #FDF2F6;
$base-100: #F9DCE7;
$base-200: #F2BBD0;
$base-300: #E38CAD;
$base-400: #D1618C;
$base-500: #B63F6C;
$base-600: #8B3757;
$base-700: #632C41;
$base-800: #41202D;
$base-900: #28151C;
$base-hover: #0E0307;
$base-subtle: #DC90AD;

{
    "color": {
        "base": {
            "value": "#100308",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FDF2F6",
                "type": "color"
            },
            "100": {
                "value": "#F9DCE7",
                "type": "color"
            },
            "200": {
                "value": "#F2BBD0",
                "type": "color"
            },
            "300": {
                "value": "#E38CAD",
                "type": "color"
            },
            "400": {
                "value": "#D1618C",
                "type": "color"
            },
            "500": {
                "value": "#B63F6C",
                "type": "color"
            },
            "600": {
                "value": "#8B3757",
                "type": "color"
            },
            "700": {
                "value": "#632C41",
                "type": "color"
            },
            "800": {
                "value": "#41202D",
                "type": "color"
            },
            "900": {
                "value": "#28151C",
                "type": "color"
            }
        }
    }
}

Palettes built on #100308

Color Lab

Pairs with #100308

UI roles & guardrails

In real applications

Scales

Every model

Export