What color is #104F9B?

#104F9B is a dark, vivid blue. In RGB it is rgb(16, 79, 155), and in HSL hsl(213, 81%, 34%).

Is #104F9B accessible as text?

On white, #104F9B has a contrast ratio of 8.03:1 (passes WCAG AA for body text); on black it is 2.61:1 (fails). For text placed on #104F9B, use white for the best readability.

What is the closest Tailwind color to #104F9B?

The nearest Tailwind CSS token is sky-800 (#00598A).

What colors go well with #104F9B?

#104F9B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9D5E10. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #104F9B below.

Is #104F9B good for buttons?

#104F9B works well for buttons and highlights, but use white text on #104F9B — black text only reaches 2.61:1, below the 4.5:1 needed for normal-size labels.

Is #104F9B the same as CSS darkslateblue?

No — #104F9B is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#104F9B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #104F9B

Not just a swatch — here's how #104F9B works with other colors. Named schemes with #104F9B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #104F9B Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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

Tech Product Signal · 5 colors

Signal #104F9B Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3F74BA

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.

Vintage Leather Lead · 5 colors

Lead #104F9B Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

Cobalt Blue plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Berry & Cream Lead · 5 colors

Lead #104F9B Surface #EDE9D6 Anchor #5A2145 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 #F6F4EF Accent #104F9B Secondary #677A96 Support #9D8F89 Ink #16140F

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.

Build a working theme in the generator →

Color Lab

How #104F9B 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 13/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 58/100

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 38/100

Low

A faint retro warmth without tipping into sepia.

Luxury 61/100

High

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

Brand distinctiveness 37/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 86/100

Very high

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

Surface fit 15/100

Very low

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

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #104F9B

For UI

For branding

For interior

For fashion

People also use #104F9B with

Tiffany Blue Zaffre 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 8.0:1. Use

Subtle surface Use #CADBF1 for cards and hover fills. Tint 80

Avoid beside #10219D — 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 #104F9B 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: #104F9B;
  --color-base-rgb: 16 79 155;
  --color-base-oklch: oklch(43.5% 0.138 256.4);
  --color-50: #F1F7FE;
  --color-100: #D9E9FC;
  --color-200: #B5D3F7;
  --color-300: #83B2EC;
  --color-400: #5692DC;
  --color-500: #3373C2;
  --color-600: #2E5C93;
  --color-700: #274468;
  --color-800: #1D2F44;
  --color-900: #141E2A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F1F7FE',
    100: '#D9E9FC',
    200: '#B5D3F7',
    300: '#83B2EC',
    400: '#5692DC',
    500: '#3373C2',
    600: '#2E5C93',
    700: '#274468',
    800: '#1D2F44',
    900: '#141E2A',
  },
}

$base: #104F9B;
$base-ink: #FFFFFF;
$base-50: #F1F7FE;
$base-100: #D9E9FC;
$base-200: #B5D3F7;
$base-300: #83B2EC;
$base-400: #5692DC;
$base-500: #3373C2;
$base-600: #2E5C93;
$base-700: #274468;
$base-800: #1D2F44;
$base-900: #141E2A;
$base-hover: #0D407E;
$base-subtle: #ADC9EC;

{
    "color": {
        "base": {
            "value": "#104F9B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F7FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E9FC",
                "type": "color"
            },
            "200": {
                "value": "#B5D3F7",
                "type": "color"
            },
            "300": {
                "value": "#83B2EC",
                "type": "color"
            },
            "400": {
                "value": "#5692DC",
                "type": "color"
            },
            "500": {
                "value": "#3373C2",
                "type": "color"
            },
            "600": {
                "value": "#2E5C93",
                "type": "color"
            },
            "700": {
                "value": "#274468",
                "type": "color"
            },
            "800": {
                "value": "#1D2F44",
                "type": "color"
            },
            "900": {
                "value": "#141E2A",
                "type": "color"
            }
        }
    }
}