What color is #001CB8?

#001CB8 is a dark, vivid blue. In RGB it is rgb(0, 28, 184), and in HSL hsl(231, 100%, 36%).

Is #001CB8 accessible as text?

On white, #001CB8 has a contrast ratio of 11.30:1 (passes WCAG AA for body text); on black it is 1.86:1 (fails). For text placed on #001CB8, use white for the best readability.

What is the closest Tailwind color to #001CB8?

The nearest Tailwind CSS token is blue-800 (#193CB8).

What colors go well with #001CB8?

#001CB8 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B89C00. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #001CB8 below.

Is #001CB8 good for buttons?

#001CB8 works well for buttons and highlights, but use white text on #001CB8 — black text only reaches 1.86:1, below the 4.5:1 needed for normal-size labels.

Is #001CB8 the same as CSS mediumblue?

No — #001CB8 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#001CB8 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #001CB8

Not just a swatch — here's how #001CB8 works with other colors. Named schemes with #001CB8 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #001CB8 Anchor #141210 Accent #ACAE53 Secondary #242933 Surface #F0EEE3

Zaffre 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.

Tech Product Signal · 5 colors

Signal #001CB8 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #2052D5

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

Moody Editorial Color · 5 colors

Color #001CB8 Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #21006C

Zaffre adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Zaffre.

Coastal Morning Lead · 5 colors

Lead #001CB8 Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #001CB8 Secondary #4F6696 Support #9D8F88 Ink #18140F

Zaffre 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 Zaffre carrying the quiet middle.

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Color Lab

How #001CB8 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 9/100

Cool

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

Softness 22/100

Low

Firm and assertive — carries weight and contrast.

Depth 69/100

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 10/100

Very low

Clean and current — no dusty, aged cast.

Luxury 59/100

Moderate

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

Brand distinctiveness 90/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 46/100

Moderate

Workable accent with care around contrast.

Surface fit 16/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 57/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #001CB8

For UI

For branding

For interior

For fashion

People also use #001CB8 with

Carolina Blue Grape Dark Goldenrod Gainsboro Prussian Blue

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 11.3:1. Use

Subtle surface Use #C7CEF6 for cards and hover fills. Tint 80

Avoid beside #2200B8 — 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 #001CB8 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: #001CB8;
  --color-base-rgb: 0 28 184;
  --color-base-oklch: oklch(37.3% 0.232 264.2);
  --color-50: #F0F2FE;
  --color-100: #D8DDFD;
  --color-200: #B1BCFC;
  --color-300: #778AF8;
  --color-400: #465FEC;
  --color-500: #223DD2;
  --color-600: #23359F;
  --color-700: #1F2B70;
  --color-800: #182048;
  --color-900: #11152C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  zaffre: {
    50: '#F0F2FE',
    100: '#D8DDFD',
    200: '#B1BCFC',
    300: '#778AF8',
    400: '#465FEC',
    500: '#223DD2',
    600: '#23359F',
    700: '#1F2B70',
    800: '#182048',
    900: '#11152C',
  },
}

$base: #001CB8;
$base-ink: #FFFFFF;
$base-50: #F0F2FE;
$base-100: #D8DDFD;
$base-200: #B1BCFC;
$base-300: #778AF8;
$base-400: #465FEC;
$base-500: #223DD2;
$base-600: #23359F;
$base-700: #1F2B70;
$base-800: #182048;
$base-900: #11152C;
$base-hover: #001693;
$base-subtle: #A9B4F3;

{
    "color": {
        "base": {
            "value": "#001CB8",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F2FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DDFD",
                "type": "color"
            },
            "200": {
                "value": "#B1BCFC",
                "type": "color"
            },
            "300": {
                "value": "#778AF8",
                "type": "color"
            },
            "400": {
                "value": "#465FEC",
                "type": "color"
            },
            "500": {
                "value": "#223DD2",
                "type": "color"
            },
            "600": {
                "value": "#23359F",
                "type": "color"
            },
            "700": {
                "value": "#1F2B70",
                "type": "color"
            },
            "800": {
                "value": "#182048",
                "type": "color"
            },
            "900": {
                "value": "#11152C",
                "type": "color"
            }
        }
    }
}

Palettes built on #001CB8

Color Lab

Pairs with #001CB8

UI roles & guardrails

In real applications

Scales

Every model

Export