What color is #013FB2?

#013FB2 is a dark, vivid blue. In RGB it is rgb(1, 63, 178), and in HSL hsl(219, 99%, 35%).

Is #013FB2 accessible as text?

On white, #013FB2 has a contrast ratio of 8.92:1 (passes WCAG AA for body text); on black it is 2.36:1 (fails). For text placed on #013FB2, use white for the best readability.

What is the closest Tailwind color to #013FB2?

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

What colors go well with #013FB2?

#013FB2 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B27401. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #013FB2 below.

Is #013FB2 good for buttons?

#013FB2 works well for buttons and highlights, but use white text on #013FB2 — black text only reaches 2.36:1, below the 4.5:1 needed for normal-size labels.

Is #013FB2 the same as CSS mediumblue?

No — #013FB2 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#013FB2 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #013FB2

Not just a swatch — here's how #013FB2 works with other colors. Named schemes with #013FB2 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #013FB2 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3268D0

Cobalt 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 Cobalt Blue.

Coastal Morning Lead · 5 colors

Lead #013FB2 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cobalt 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 #013FB2 Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Cobalt 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 #013FB2 Secondary #5F749C Support #9D8F88 Ink #18140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #013FB2 Secondary #E76A75 Accent #F79152 Anchor #573B58 Surface #EEEBD6

Cobalt Blue 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 #013FB2 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 8/100

Cool

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

Softness 28/100

Low

Firm and assertive — carries weight and contrast.

Depth 62/100

High

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 23/100

Low

Clean and current — no dusty, aged cast.

Luxury 58/100

Moderate

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

Brand distinctiveness 74/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 73/100

High

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

Surface fit 13/100

Very low

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

Print safety 64/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #013FB2

For UI

For branding

For interior

For fashion

People also use #013FB2 with

Lagoon Blue Zaffre Olive Brown 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 8.9:1. Use

Subtle surface Use #C6D7F5 for cards and hover fills. Tint 80

Avoid beside #0104B2 — 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 #013FB2 at work across the surfaces designers actually ship.

Website / UI

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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: #013FB2;
  --color-base-rgb: 1 63 178;
  --color-base-oklch: oklch(41.9% 0.191 261.9);
  --color-50: #F0F5FE;
  --color-100: #D8E5FD;
  --color-200: #B1CBFC;
  --color-300: #78A4F7;
  --color-400: #4780EB;
  --color-500: #2360D2;
  --color-600: #234E9F;
  --color-700: #1F3B6F;
  --color-800: #192948;
  --color-900: #111B2C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F0F5FE',
    100: '#D8E5FD',
    200: '#B1CBFC',
    300: '#78A4F7',
    400: '#4780EB',
    500: '#2360D2',
    600: '#234E9F',
    700: '#1F3B6F',
    800: '#192948',
    900: '#111B2C',
  },
}

$base: #013FB2;
$base-ink: #FFFFFF;
$base-50: #F0F5FE;
$base-100: #D8E5FD;
$base-200: #B1CBFC;
$base-300: #78A4F7;
$base-400: #4780EB;
$base-500: #2360D2;
$base-600: #234E9F;
$base-700: #1F3B6F;
$base-800: #192948;
$base-900: #111B2C;
$base-hover: #01328E;
$base-subtle: #A8C2F3;

{
    "color": {
        "base": {
            "value": "#013FB2",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F5FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E5FD",
                "type": "color"
            },
            "200": {
                "value": "#B1CBFC",
                "type": "color"
            },
            "300": {
                "value": "#78A4F7",
                "type": "color"
            },
            "400": {
                "value": "#4780EB",
                "type": "color"
            },
            "500": {
                "value": "#2360D2",
                "type": "color"
            },
            "600": {
                "value": "#234E9F",
                "type": "color"
            },
            "700": {
                "value": "#1F3B6F",
                "type": "color"
            },
            "800": {
                "value": "#192948",
                "type": "color"
            },
            "900": {
                "value": "#111B2C",
                "type": "color"
            }
        }
    }
}

Palettes built on #013FB2

Color Lab

Pairs with #013FB2

UI roles & guardrails

In real applications

Scales

Every model

Export