What color is #181DBF?

#181DBF is a medium, vivid blue. In RGB it is rgb(24, 29, 191), and in HSL hsl(238, 78%, 42%).

Is #181DBF accessible as text?

On white, #181DBF has a contrast ratio of 10.68:1 (passes WCAG AA for body text); on black it is 1.97:1 (fails). For text placed on #181DBF, use white for the best readability.

What is the closest Tailwind color to #181DBF?

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

What colors go well with #181DBF?

#181DBF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BFB918. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #181DBF below.

Is #181DBF good for buttons?

#181DBF works well for buttons and highlights, but use white text on #181DBF — black text only reaches 1.97:1, below the 4.5:1 needed for normal-size labels.

Is #181DBF the same as CSS mediumblue?

No — #181DBF is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#181DBF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #181DBF

Not just a swatch — here's how #181DBF works with other colors. Named schemes with #181DBF in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #181DBF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #3253DC

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

Coastal Morning Lead · 5 colors

Lead #181DBF Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Berry & Cream Lead · 5 colors

Lead #181DBF Surface #F6E5D8 Anchor #5B2143 Accent #E5C2CA Secondary #322B2F

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

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #181DBF Secondary #566A9B Support #9D8F88 Ink #18140F

Medium Blue 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 Medium Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #181DBF Secondary #E86A74 Accent #F79250 Anchor #573B58 Surface #F7E7D7

Medium Blue glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

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Color Lab

How #181DBF 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 10/100

Cool

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

Softness 22/100

Low

Firm and assertive — carries weight and contrast.

Depth 67/100

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 57/100

Moderate

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

Brand distinctiveness 91/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 49/100

Moderate

Workable accent with care around contrast.

Surface fit 15/100

Very low

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

Print safety 58/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #181DBF

For UI

For branding

For interior

For fashion

People also use #181DBF with

Dodger Blue Grape Brass 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 10.7:1. Use

Subtle surface Use #D1D2F2 for cards and hover fills. Tint 80

Avoid beside #4A18BF — 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 #181DBF 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: #181DBF;
  --color-base-rgb: 24 29 191;
  --color-base-oklch: oklch(38.9% 0.235 267.4);
  --color-50: #F1F1FE;
  --color-100: #DADBFB;
  --color-200: #B6B9F6;
  --color-300: #8589EA;
  --color-400: #585DDA;
  --color-500: #363ABF;
  --color-600: #303491;
  --color-700: #282A67;
  --color-800: #1E1F43;
  --color-900: #141529;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  medium-blue: {
    50: '#F1F1FE',
    100: '#DADBFB',
    200: '#B6B9F6',
    300: '#8589EA',
    400: '#585DDA',
    500: '#363ABF',
    600: '#303491',
    700: '#282A67',
    800: '#1E1F43',
    900: '#141529',
  },
}

$base: #181DBF;
$base-ink: #FFFFFF;
$base-50: #F1F1FE;
$base-100: #DADBFB;
$base-200: #B6B9F6;
$base-300: #8589EA;
$base-400: #585DDA;
$base-500: #363ABF;
$base-600: #303491;
$base-700: #282A67;
$base-800: #1E1F43;
$base-900: #141529;
$base-hover: #131799;
$base-subtle: #B8BAED;

{
    "color": {
        "base": {
            "value": "#181DBF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F1FE",
                "type": "color"
            },
            "100": {
                "value": "#DADBFB",
                "type": "color"
            },
            "200": {
                "value": "#B6B9F6",
                "type": "color"
            },
            "300": {
                "value": "#8589EA",
                "type": "color"
            },
            "400": {
                "value": "#585DDA",
                "type": "color"
            },
            "500": {
                "value": "#363ABF",
                "type": "color"
            },
            "600": {
                "value": "#303491",
                "type": "color"
            },
            "700": {
                "value": "#282A67",
                "type": "color"
            },
            "800": {
                "value": "#1E1F43",
                "type": "color"
            },
            "900": {
                "value": "#141529",
                "type": "color"
            }
        }
    }
}

Palettes built on #181DBF

Color Lab

Pairs with #181DBF

UI roles & guardrails

In real applications

Scales

Every model

Export