What color is #28366A?

#28366A is a dark blue. In RGB it is rgb(40, 54, 106), and in HSL hsl(227, 45%, 29%).

Is #28366A accessible as text?

On white, #28366A has a contrast ratio of 11.50:1 (passes WCAG AA for body text); on black it is 1.83:1 (fails). For text placed on #28366A, use white for the best readability.

What is the closest Tailwind color to #28366A?

The nearest Tailwind CSS token is indigo-900 (#312C85).

What colors go well with #28366A?

#28366A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #6B5D29. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #28366A below.

Is #28366A good for buttons?

#28366A works well for buttons and highlights, but use white text on #28366A — black text only reaches 1.83:1, below the 4.5:1 needed for normal-size labels.

Is #28366A the same as CSS darkslateblue?

No — #28366A is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#28366A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #28366A

Not just a swatch — here's how #28366A works with other colors. Named schemes with #28366A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #28366A Accent #A5C4C2 Surface #EAD5C0 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 #28366A Secondary #AEB4B8 Surface #F1F2F0 Support #7D92A7 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 #28366A Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #485889

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 #28366A Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #582239

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 #28366A Secondary #596073 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 #28366A 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 29/100

Cool

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

Softness 32/100

Low

Firm and assertive — carries weight and contrast.

Depth 64/100

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 44/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 36/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 52/100

Moderate

Workable accent with care around contrast.

Surface fit 34/100

Low

Usable as a tinted surface in measured doses.

Print safety 84/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #28366A

For UI

For branding

For interior

For fashion

People also use #28366A with

Teal Blue Indigo Dark Olive Green Gainsboro Gunmetal Gray

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 11.5:1. Use

Subtle surface Use #CFD4E7 for cards and hover fills. Tint 80

Avoid beside #30296B — 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 #28366A 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: #28366A;
  --color-base-rgb: 40 54 106;
  --color-base-oklch: oklch(35.0% 0.092 269.8);
  --color-50: #F4F5FB;
  --color-100: #E1E5F4;
  --color-200: #C4CCE8;
  --color-300: #9BA7D5;
  --color-400: #7484BE;
  --color-500: #5364A2;
  --color-600: #45517D;
  --color-700: #353D5A;
  --color-800: #262A3B;
  --color-900: #191B25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F4F5FB',
    100: '#E1E5F4',
    200: '#C4CCE8',
    300: '#9BA7D5',
    400: '#7484BE',
    500: '#5364A2',
    600: '#45517D',
    700: '#353D5A',
    800: '#262A3B',
    900: '#191B25',
  },
}

$base: #28366A;
$base-ink: #FFFFFF;
$base-50: #F4F5FB;
$base-100: #E1E5F4;
$base-200: #C4CCE8;
$base-300: #9BA7D5;
$base-400: #7484BE;
$base-500: #5364A2;
$base-600: #45517D;
$base-700: #353D5A;
$base-800: #262A3B;
$base-900: #191B25;
$base-hover: #212C56;
$base-subtle: #B6BEDB;

{
    "color": {
        "base": {
            "value": "#28366A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F5FB",
                "type": "color"
            },
            "100": {
                "value": "#E1E5F4",
                "type": "color"
            },
            "200": {
                "value": "#C4CCE8",
                "type": "color"
            },
            "300": {
                "value": "#9BA7D5",
                "type": "color"
            },
            "400": {
                "value": "#7484BE",
                "type": "color"
            },
            "500": {
                "value": "#5364A2",
                "type": "color"
            },
            "600": {
                "value": "#45517D",
                "type": "color"
            },
            "700": {
                "value": "#353D5A",
                "type": "color"
            },
            "800": {
                "value": "#262A3B",
                "type": "color"
            },
            "900": {
                "value": "#191B25",
                "type": "color"
            }
        }
    }
}