What color is #263C66?

#263C66 is a dark blue. In RGB it is rgb(38, 60, 102), and in HSL hsl(219, 46%, 27%).

Is #263C66 accessible as text?

On white, #263C66 has a contrast ratio of 10.93:1 (passes WCAG AA for body text); on black it is 1.92:1 (fails). For text placed on #263C66, use white for the best readability.

What is the closest Tailwind color to #263C66?

The nearest Tailwind CSS token is sky-900 (#024A70).

What colors go well with #263C66?

#263C66 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #654E25. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #263C66 below.

Is #263C66 good for buttons?

#263C66 works well for buttons and highlights, but use white text on #263C66 — black text only reaches 1.92:1, below the 4.5:1 needed for normal-size labels.

Is #263C66 the same as CSS darkslateblue?

No — #263C66 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#263C66 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #263C66

Not just a swatch — here's how #263C66 works with other colors. Named schemes with #263C66 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #263C66 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Nordic Calm Accent · 5 colors

Accent #263C66 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Yale Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #263C66 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #485E86

Yale 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 Yale Blue.

Vintage Leather Lead · 5 colors

Lead #263C66 Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Yale 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #263C66 Secondary #5B6473 Support #9D8F88 Ink #18140F

Yale 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 Yale Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #263C66 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 30/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

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 43/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 30/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 52/100

Moderate

Workable accent with care around contrast.

Surface fit 38/100

Low

Usable as a tinted surface in measured doses.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #263C66

For UI

For branding

For interior

For fashion

People also use #263C66 with

Myrtle Green Russian Violet Coffee 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 10.9:1. Use

Subtle surface Use #CDD6E6 for cards and hover fills. Tint 80

Avoid beside #252665 — 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 #263C66 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: #263C66;
  --color-base-rgb: 38 60 102;
  --color-base-oklch: oklch(36.0% 0.078 262.3);
  --color-50: #F3F6FB;
  --color-100: #E1E8F5;
  --color-200: #C4D1E9;
  --color-300: #9AAFD5;
  --color-400: #738EBF;
  --color-500: #526EA3;
  --color-600: #44587E;
  --color-700: #35425A;
  --color-800: #252D3C;
  --color-900: #181D25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F3F6FB',
    100: '#E1E8F5',
    200: '#C4D1E9',
    300: '#9AAFD5',
    400: '#738EBF',
    500: '#526EA3',
    600: '#44587E',
    700: '#35425A',
    800: '#252D3C',
    900: '#181D25',
  },
}

$base: #263C66;
$base-ink: #FFFFFF;
$base-50: #F3F6FB;
$base-100: #E1E8F5;
$base-200: #C4D1E9;
$base-300: #9AAFD5;
$base-400: #738EBF;
$base-500: #526EA3;
$base-600: #44587E;
$base-700: #35425A;
$base-800: #252D3C;
$base-900: #181D25;
$base-hover: #1E2F50;
$base-subtle: #B4C1DB;

{
    "color": {
        "base": {
            "value": "#263C66",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F6FB",
                "type": "color"
            },
            "100": {
                "value": "#E1E8F5",
                "type": "color"
            },
            "200": {
                "value": "#C4D1E9",
                "type": "color"
            },
            "300": {
                "value": "#9AAFD5",
                "type": "color"
            },
            "400": {
                "value": "#738EBF",
                "type": "color"
            },
            "500": {
                "value": "#526EA3",
                "type": "color"
            },
            "600": {
                "value": "#44587E",
                "type": "color"
            },
            "700": {
                "value": "#35425A",
                "type": "color"
            },
            "800": {
                "value": "#252D3C",
                "type": "color"
            },
            "900": {
                "value": "#181D25",
                "type": "color"
            }
        }
    }
}