What color is #0318BB?

#0318BB is a dark, vivid blue. In RGB it is rgb(3, 24, 187), and in HSL hsl(233, 97%, 37%).

Is #0318BB accessible as text?

On white, #0318BB has a contrast ratio of 11.34:1 (passes WCAG AA for body text); on black it is 1.85:1 (fails). For text placed on #0318BB, use white for the best readability.

What is the closest Tailwind color to #0318BB?

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

What colors go well with #0318BB?

#0318BB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BAA503. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0318BB below.

Is #0318BB good for buttons?

#0318BB works well for buttons and highlights, but use white text on #0318BB — black text only reaches 1.85:1, below the 4.5:1 needed for normal-size labels.

Is #0318BB the same as CSS mediumblue?

No — #0318BB is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#0318BB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0318BB

Not just a swatch — here's how #0318BB works with other colors. Named schemes with #0318BB in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #0318BB Anchor #141210 Accent #ACAE53 Secondary #242933 Surface #F0EEE3

Medium Blue 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 #0318BB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #2150D8

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.

Moody Editorial Color · 5 colors

Color #0318BB Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #22006D

Medium Blue 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 Medium Blue.

Coastal Morning Lead · 5 colors

Lead #0318BB Accent #A5C4C2 Surface #DDDBBF 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #0318BB Secondary #4F6697 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.

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Color Lab

How #0318BB 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 21/100

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 9/100

Very low

Clean and current — no dusty, aged cast.

Luxury 58/100

Moderate

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

Brand distinctiveness 92/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 45/100

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 56/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #0318BB

For UI

For branding

For interior

For fashion

People also use #0318BB 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 #C8CEF5 for cards and hover fills. Tint 80

Avoid beside #2A03BA — 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 #0318BB 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: #0318BB;
  --color-base-rgb: 3 24 187;
  --color-base-oklch: oklch(37.4% 0.238 264.6);
  --color-50: #F0F2FE;
  --color-100: #D8DCFD;
  --color-200: #B1B9FC;
  --color-300: #7988F6;
  --color-400: #495BE9;
  --color-500: #2539D0;
  --color-600: #25339D;
  --color-700: #20296F;
  --color-800: #191F48;
  --color-900: #11152C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  medium-blue: {
    50: '#F0F2FE',
    100: '#D8DCFD',
    200: '#B1B9FC',
    300: '#7988F6',
    400: '#495BE9',
    500: '#2539D0',
    600: '#25339D',
    700: '#20296F',
    800: '#191F48',
    900: '#11152C',
  },
}

$base: #0318BB;
$base-ink: #FFFFFF;
$base-50: #F0F2FE;
$base-100: #D8DCFD;
$base-200: #B1B9FC;
$base-300: #7988F6;
$base-400: #495BE9;
$base-500: #2539D0;
$base-600: #25339D;
$base-700: #20296F;
$base-800: #191F48;
$base-900: #11152C;
$base-hover: #021395;
$base-subtle: #ABB4F2;

{
    "color": {
        "base": {
            "value": "#0318BB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F2FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DCFD",
                "type": "color"
            },
            "200": {
                "value": "#B1B9FC",
                "type": "color"
            },
            "300": {
                "value": "#7988F6",
                "type": "color"
            },
            "400": {
                "value": "#495BE9",
                "type": "color"
            },
            "500": {
                "value": "#2539D0",
                "type": "color"
            },
            "600": {
                "value": "#25339D",
                "type": "color"
            },
            "700": {
                "value": "#20296F",
                "type": "color"
            },
            "800": {
                "value": "#191F48",
                "type": "color"
            },
            "900": {
                "value": "#11152C",
                "type": "color"
            }
        }
    }
}

Palettes built on #0318BB

Color Lab

Pairs with #0318BB

UI roles & guardrails

In real applications

Scales

Every model

Export