What color is #0B40DD?

#0B40DD is a medium, vivid blue. In RGB it is rgb(11, 64, 221), and in HSL hsl(225, 91%, 45%).

Is #0B40DD accessible as text?

On white, #0B40DD has a contrast ratio of 7.52:1 (passes WCAG AA for body text); on black it is 2.79:1 (fails). For text placed on #0B40DD, use white for the best readability.

What is the closest Tailwind color to #0B40DD?

The nearest Tailwind CSS token is blue-700 (#1447E6).

What colors go well with #0B40DD?

#0B40DD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DBA70A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0B40DD below.

Is #0B40DD good for buttons?

#0B40DD works well for buttons and highlights, but use white text on #0B40DD — black text only reaches 2.79:1, below the 4.5:1 needed for normal-size labels.

Is #0B40DD the same as CSS blue?

No — #0B40DD is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#0B40DD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0B40DD

Not just a swatch — here's how #0B40DD works with other colors. Named schemes with #0B40DD in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #0B40DD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #366FFA

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

Coastal Morning Lead · 5 colors

Lead #0B40DD Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cerulean 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 #0B40DD Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Cerulean 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 #0B40DD Secondary #6881B5 Support #9D8F88 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #0B40DD Secondary #E76A75 Accent #F79251 Anchor #573B58 Surface #F7E7D7

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

Build a working theme in the generator →

Color Lab

How #0B40DD 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 26/100

Low

Firm and assertive — carries weight and contrast.

Depth 59/100

Moderate

Mid depth — usable as an accent or a muted ground.

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 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 93/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 62/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 10/100

Very low

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

Print safety 56/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #0B40DD

For UI

For branding

For interior

For fashion

People also use #0B40DD with

Lagoon Blue Han Purple Dijon Gainsboro Charcoal

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 7.5:1. Use

Subtle surface Use #D1DAF5 for cards and hover fills. Tint 80

Avoid beside #1C0ADB — 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 #0B40DD at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

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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: #0B40DD;
  --color-base-rgb: 11 64 221;
  --color-base-oklch: oklch(46.6% 0.241 264.1);
  --color-50: #F0F4FE;
  --color-100: #D8E1FD;
  --color-200: #B1C4FB;
  --color-300: #7D9AF2;
  --color-400: #4E73E4;
  --color-500: #2A52CB;
  --color-600: #28459A;
  --color-700: #23356C;
  --color-800: #1B2646;
  --color-900: #12182B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F0F4FE',
    100: '#D8E1FD',
    200: '#B1C4FB',
    300: '#7D9AF2',
    400: '#4E73E4',
    500: '#2A52CB',
    600: '#28459A',
    700: '#23356C',
    800: '#1B2646',
    900: '#12182B',
  },
}

$base: #0B40DD;
$base-ink: #FFFFFF;
$base-50: #F0F4FE;
$base-100: #D8E1FD;
$base-200: #B1C4FB;
$base-300: #7D9AF2;
$base-400: #4E73E4;
$base-500: #2A52CB;
$base-600: #28459A;
$base-700: #23356C;
$base-800: #1B2646;
$base-900: #12182B;
$base-hover: #0832AF;
$base-subtle: #B8C6F2;

{
    "color": {
        "base": {
            "value": "#0B40DD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E1FD",
                "type": "color"
            },
            "200": {
                "value": "#B1C4FB",
                "type": "color"
            },
            "300": {
                "value": "#7D9AF2",
                "type": "color"
            },
            "400": {
                "value": "#4E73E4",
                "type": "color"
            },
            "500": {
                "value": "#2A52CB",
                "type": "color"
            },
            "600": {
                "value": "#28459A",
                "type": "color"
            },
            "700": {
                "value": "#23356C",
                "type": "color"
            },
            "800": {
                "value": "#1B2646",
                "type": "color"
            },
            "900": {
                "value": "#12182B",
                "type": "color"
            }
        }
    }
}

Palettes built on #0B40DD

Color Lab

Pairs with #0B40DD

UI roles & guardrails

In real applications

Scales

Every model

Export