What color is #210101?

#210101 is a very dark, vivid red. In RGB it is rgb(33, 1, 1), and in HSL hsl(0, 94%, 7%).

Is #210101 accessible as text?

On white, #210101 has a contrast ratio of 19.64:1 (passes WCAG AA for body text); on black it is 1.07:1 (fails). For text placed on #210101, use white for the best readability.

What is the closest Tailwind color to #210101?

The nearest Tailwind CSS token is taupe-950 (#0C0A09).

What colors go well with #210101?

#210101 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #012323. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #210101 below.

Is #210101 good for buttons?

#210101 works well for buttons and highlights, but use white text on #210101 — black text only reaches 1.07:1, below the 4.5:1 needed for normal-size labels.

Is #210101 the same as CSS black?

No — #210101 is not the CSS named color black, but black (#000000) is the closest CSS named color.

#210101 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #210101

Not just a swatch — here's how #210101 works with other colors. Named schemes with #210101 in its natural role, and a note on why the supporting colors balance it.

Warm Autumn Interior Dominant · 5 colors

Dominant #210101 Secondary #B76325 Accent #777743 Surface #F4EBDD Anchor #3B2A21

This palette keeps Jet Black as the dominant warm neutral, balanced by muted terracotta and olive earth tones and grounded by a deep espresso anchor.

Vintage Leather Lead · 5 colors

Lead #210101 Secondary #7B4927 Surface #EAD9C0 Accent #43503A Anchor #5A222E

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.

Desert Clay Center · 5 colors

Center #210101 Surface #E3CEA8 Secondary #B17958 Accent #98976D Anchor #3E2C21

Jet Black holds the warm center of this desert palette with sand and clay beside it, a muted-sage accent and a dark-brown anchor.

Japanese Sand Base · 5 colors

Base #210101 Surface #F0E9DC Highlight #F7F1E7 Secondary #BBAEA0 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.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #210101 Secondary #382A28 Support #9B9186 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.

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Color Lab

How #210101 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 67/100

Warm

Reads warm and advancing — inviting, energetic, draws the eye forward.

Softness 17/100

Very low

Firm and assertive — carries weight and contrast.

Depth 81/100

Very high

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

Naturalness 68/100

High

Organic, earthy character — at home in wellness, food and craft brands.

Vintage feel 35/100

Low

A faint retro warmth without tipping into sepia.

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 56/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 93/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #210101

For UI

For branding

For interior

For fashion

People also use #210101 with

Oxblood Graphite Gainsboro Espresso

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 19.6:1. Use

Subtle surface Use #F0AFAF for cards and hover fills. Tint 80

Avoid beside #230C01 — 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 #210101 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

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Export

:root {
  --color-base: #210101;
  --color-base-rgb: 33 1 1;
  --color-base-oklch: oklch(15.9% 0.061 27.8);
  --color-50: #FEF0F0;
  --color-100: #FDD8D8;
  --color-200: #FCB1B1;
  --color-300: #F47B7B;
  --color-400: #E74B4B;
  --color-500: #CD2828;
  --color-600: #9B2626;
  --color-700: #6D2121;
  --color-800: #471A1A;
  --color-900: #2B1212;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#FEF0F0',
    100: '#FDD8D8',
    200: '#FCB1B1',
    300: '#F47B7B',
    400: '#E74B4B',
    500: '#CD2828',
    600: '#9B2626',
    700: '#6D2121',
    800: '#471A1A',
    900: '#2B1212',
  },
}

$base: #210101;
$base-ink: #FFFFFF;
$base-50: #FEF0F0;
$base-100: #FDD8D8;
$base-200: #FCB1B1;
$base-300: #F47B7B;
$base-400: #E74B4B;
$base-500: #CD2828;
$base-600: #9B2626;
$base-700: #6D2121;
$base-800: #471A1A;
$base-900: #2B1212;
$base-hover: #1C0101;
$base-subtle: #EB8585;

{
    "color": {
        "base": {
            "value": "#210101",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FEF0F0",
                "type": "color"
            },
            "100": {
                "value": "#FDD8D8",
                "type": "color"
            },
            "200": {
                "value": "#FCB1B1",
                "type": "color"
            },
            "300": {
                "value": "#F47B7B",
                "type": "color"
            },
            "400": {
                "value": "#E74B4B",
                "type": "color"
            },
            "500": {
                "value": "#CD2828",
                "type": "color"
            },
            "600": {
                "value": "#9B2626",
                "type": "color"
            },
            "700": {
                "value": "#6D2121",
                "type": "color"
            },
            "800": {
                "value": "#471A1A",
                "type": "color"
            },
            "900": {
                "value": "#2B1212",
                "type": "color"
            }
        }
    }
}

Palettes built on #210101

Color Lab

Pairs with #210101

UI roles & guardrails

In real applications

Scales

Every model

Export