What color is #100421?

#100421 is a very dark, vivid violet. In RGB it is rgb(16, 4, 33), and in HSL hsl(265, 78%, 7%).

Is #100421 accessible as text?

On white, #100421 has a contrast ratio of 19.79:1 (passes WCAG AA for body text); on black it is 1.06:1 (fails). For text placed on #100421, use white for the best readability.

What is the closest Tailwind color to #100421?

The nearest Tailwind CSS token is mauve-950 (#0C090C).

What colors go well with #100421?

#100421 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #142004. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #100421 below.

Is #100421 good for buttons?

#100421 works well for buttons and highlights, but use white text on #100421 — black text only reaches 1.06:1, below the 4.5:1 needed for normal-size labels.

Is #100421 the same as CSS black?

No — #100421 is not the CSS named color black, but black (#000000) is the closest CSS named color.

#100421 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #100421

Not just a swatch — here's how #100421 works with other colors. Named schemes with #100421 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #100421 Accent #A5C4C4 Surface #E9D6BF Secondary #9AA0A1 Anchor #23334B

Jet Black opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Nordic Calm Accent · 5 colors

Accent #100421 Secondary #AFB4B8 Surface #F1F2F0 Support #7F92A7 Anchor #2E3236

Jet Black keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Vintage Leather Lead · 5 colors

Lead #100421 Secondary #7E4632 Surface #EDD8C2 Accent #355248 Anchor #582237

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.

Luxury Packaging Feature · 5 colors

Feature #100421 Anchor #141210 Accent #DA9856 Secondary #2A2732 Surface #F3ECE3

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 #F8F4EF Accent #100421 Secondary #2D2A35 Support #9C9088 Ink #18140F

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.

Build a working theme in the generator →

Color Lab

How #100421 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 44/100

Neutral

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

Softness 16/100

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 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 25/100

Low

Clean and current — no dusty, aged cast.

Luxury 82/100

Very high

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

Brand distinctiveness 23/100

Low

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

UI accent fit 7/100

Very low

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

Surface fit 57/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 92/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #100421

For UI

For branding

For interior

For fashion

People also use #100421 with

Navy Jet Black Graphite Gainsboro Russian Violet

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 19.8:1. Use

Subtle surface Use #CBB5EA for cards and hover fills. Tint 80

Avoid beside #190420 — 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 #100421 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: #100421;
  --color-base-rgb: 16 4 33;
  --color-base-oklch: oklch(15.2% 0.061 299.4);
  --color-50: #F6F1FE;
  --color-100: #E8DAFB;
  --color-200: #D1B6F6;
  --color-300: #AF85EA;
  --color-400: #8E58DA;
  --color-500: #6F36BF;
  --color-600: #593091;
  --color-700: #422867;
  --color-800: #2D1E43;
  --color-900: #1D1429;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F6F1FE',
    100: '#E8DAFB',
    200: '#D1B6F6',
    300: '#AF85EA',
    400: '#8E58DA',
    500: '#6F36BF',
    600: '#593091',
    700: '#422867',
    800: '#2D1E43',
    900: '#1D1429',
  },
}

$base: #100421;
$base-ink: #FFFFFF;
$base-50: #F6F1FE;
$base-100: #E8DAFB;
$base-200: #D1B6F6;
$base-300: #AF85EA;
$base-400: #8E58DA;
$base-500: #6F36BF;
$base-600: #593091;
$base-700: #422867;
$base-800: #2D1E43;
$base-900: #1D1429;
$base-hover: #0C0319;
$base-subtle: #B18EE2;

{
    "color": {
        "base": {
            "value": "#100421",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F1FE",
                "type": "color"
            },
            "100": {
                "value": "#E8DAFB",
                "type": "color"
            },
            "200": {
                "value": "#D1B6F6",
                "type": "color"
            },
            "300": {
                "value": "#AF85EA",
                "type": "color"
            },
            "400": {
                "value": "#8E58DA",
                "type": "color"
            },
            "500": {
                "value": "#6F36BF",
                "type": "color"
            },
            "600": {
                "value": "#593091",
                "type": "color"
            },
            "700": {
                "value": "#422867",
                "type": "color"
            },
            "800": {
                "value": "#2D1E43",
                "type": "color"
            },
            "900": {
                "value": "#1D1429",
                "type": "color"
            }
        }
    }
}

Palettes built on #100421

Color Lab

Pairs with #100421

UI roles & guardrails

In real applications

Scales

Every model

Export