What color is #000331?

#000331 is a very dark, vivid blue. In RGB it is rgb(0, 3, 49), and in HSL hsl(236, 100%, 10%).

Is #000331 accessible as text?

On white, #000331 has a contrast ratio of 19.86:1 (passes WCAG AA for body text); on black it is 1.06:1 (fails). For text placed on #000331, use white for the best readability.

What is the closest Tailwind color to #000331?

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

What colors go well with #000331?

#000331 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #333000. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #000331 below.

Is #000331 good for buttons?

#000331 works well for buttons and highlights, but use white text on #000331 — black text only reaches 1.06:1, below the 4.5:1 needed for normal-size labels.

Is #000331 the same as CSS midnightblue?

No — #000331 is not the CSS named color midnightblue, but midnightblue (#191970) 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.

#000331 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #000331

Not just a swatch — here's how #000331 works with other colors. Named schemes with #000331 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #000331 Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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 #000331 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A7 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.

Tech Product Signal · 5 colors

Signal #000331 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #11244E

Jet Black is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Jet Black.

Vintage Leather Lead · 5 colors

Lead #000331 Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #000331 Secondary #232B3C Support #9D8F88 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 #000331 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 27/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 15/100

Very low

Firm and assertive — carries weight and contrast.

Depth 84/100

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

A faint retro warmth without tipping into sepia.

Luxury 86/100

Very high

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

Brand distinctiveness 35/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 8/100

Very low

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

Surface fit 47/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 83/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #000331

For UI

For branding

For interior

For fashion

People also use #000331 with

Prussian Blue Deep Purple Bistre Gainsboro

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 19.9:1. Use

Subtle surface Use #B0B4F2 for cards and hover fills. Tint 80

Avoid beside #0E0033 — 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 #000331 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: #000331;
  --color-base-rgb: 0 3 49;
  --color-base-oklch: oklch(15.1% 0.092 264.2);
  --color-50: #F0F1FE;
  --color-100: #D8DAFD;
  --color-200: #B1B6FC;
  --color-300: #7780F8;
  --color-400: #4651EC;
  --color-500: #222ED2;
  --color-600: #232B9F;
  --color-700: #1F2470;
  --color-800: #181C48;
  --color-900: #11132C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F0F1FE',
    100: '#D8DAFD',
    200: '#B1B6FC',
    300: '#7780F8',
    400: '#4651EC',
    500: '#222ED2',
    600: '#232B9F',
    700: '#1F2470',
    800: '#181C48',
    900: '#11132C',
  },
}

$base: #000331;
$base-ink: #FFFFFF;
$base-50: #F0F1FE;
$base-100: #D8DAFD;
$base-200: #B1B6FC;
$base-300: #7780F8;
$base-400: #4651EC;
$base-500: #222ED2;
$base-600: #232B9F;
$base-700: #1F2470;
$base-800: #181C48;
$base-900: #11132C;
$base-hover: #000329;
$base-subtle: #868DEE;

{
    "color": {
        "base": {
            "value": "#000331",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F1FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DAFD",
                "type": "color"
            },
            "200": {
                "value": "#B1B6FC",
                "type": "color"
            },
            "300": {
                "value": "#7780F8",
                "type": "color"
            },
            "400": {
                "value": "#4651EC",
                "type": "color"
            },
            "500": {
                "value": "#222ED2",
                "type": "color"
            },
            "600": {
                "value": "#232B9F",
                "type": "color"
            },
            "700": {
                "value": "#1F2470",
                "type": "color"
            },
            "800": {
                "value": "#181C48",
                "type": "color"
            },
            "900": {
                "value": "#11132C",
                "type": "color"
            }
        }
    }
}

Palettes built on #000331

Color Lab

Pairs with #000331

UI roles & guardrails

In real applications

Scales

Every model

Export