What color is #09288E?

#09288E is a dark, vivid blue. In RGB it is rgb(9, 40, 142), and in HSL hsl(226, 88%, 30%).

Is #09288E accessible as text?

On white, #09288E has a contrast ratio of 12.31:1 (passes WCAG AA for body text); on black it is 1.71:1 (fails). For text placed on #09288E, use white for the best readability.

What is the closest Tailwind color to #09288E?

The nearest Tailwind CSS token is blue-900 (#1C398E).

What colors go well with #09288E?

#09288E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #907009. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #09288E below.

Is #09288E good for buttons?

#09288E works well for buttons and highlights, but use white text on #09288E — black text only reaches 1.71:1, below the 4.5:1 needed for normal-size labels.

Is #09288E the same as CSS darkblue?

No — #09288E is not the CSS named color darkblue, but darkblue (#00008B) is the closest CSS named color.

#09288E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #09288E

Not just a swatch — here's how #09288E works with other colors. Named schemes with #09288E in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #09288E Anchor #141210 Accent #ACAE53 Secondary #242933 Surface #F4ECE3

Klein 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.

Moody Editorial Color · 5 colors

Color #09288E Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #18064F

Klein 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 Klein Blue.

Coastal Morning Lead · 5 colors

Lead #09288E Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Vintage Leather Lead · 5 colors

Lead #09288E Secondary #7F4536 Surface #EED7C2 Accent #365246 Anchor #58223A

Klein 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 #09288E Secondary #4D5D80 Support #9D8F88 Ink #18140F

Klein 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 Klein Blue carrying the quiet middle.

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Color Lab

How #09288E 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 25/100

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 24/100

Low

Clean and current — no dusty, aged cast.

Luxury 66/100

High

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

Brand distinctiveness 66/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 52/100

Moderate

Workable accent with care around contrast.

Surface fit 18/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #09288E

For UI

For branding

For interior

For fashion

People also use #09288E with

Bondi Blue Indigo 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 12.3:1. Use

Subtle surface Use #C5CFF2 for cards and hover fills. Tint 80

Avoid beside #170990 — 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 #09288E 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: #09288E;
  --color-base-rgb: 9 40 142;
  --color-base-oklch: oklch(34.1% 0.170 264.6);
  --color-50: #F0F4FE;
  --color-100: #D8E1FD;
  --color-200: #B2C3FA;
  --color-300: #7F99F0;
  --color-400: #5072E2;
  --color-500: #2D51C8;
  --color-600: #2A4498;
  --color-700: #24346B;
  --color-800: #1B2546;
  --color-900: #13182B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F0F4FE',
    100: '#D8E1FD',
    200: '#B2C3FA',
    300: '#7F99F0',
    400: '#5072E2',
    500: '#2D51C8',
    600: '#2A4498',
    700: '#24346B',
    800: '#1B2546',
    900: '#13182B',
  },
}

$base: #09288E;
$base-ink: #FFFFFF;
$base-50: #F0F4FE;
$base-100: #D8E1FD;
$base-200: #B2C3FA;
$base-300: #7F99F0;
$base-400: #5072E2;
$base-500: #2D51C8;
$base-600: #2A4498;
$base-700: #24346B;
$base-800: #1B2546;
$base-900: #13182B;
$base-hover: #072073;
$base-subtle: #A6B6ED;

{
    "color": {
        "base": {
            "value": "#09288E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E1FD",
                "type": "color"
            },
            "200": {
                "value": "#B2C3FA",
                "type": "color"
            },
            "300": {
                "value": "#7F99F0",
                "type": "color"
            },
            "400": {
                "value": "#5072E2",
                "type": "color"
            },
            "500": {
                "value": "#2D51C8",
                "type": "color"
            },
            "600": {
                "value": "#2A4498",
                "type": "color"
            },
            "700": {
                "value": "#24346B",
                "type": "color"
            },
            "800": {
                "value": "#1B2546",
                "type": "color"
            },
            "900": {
                "value": "#13182B",
                "type": "color"
            }
        }
    }
}

Palettes built on #09288E

Color Lab

Pairs with #09288E

UI roles & guardrails

In real applications

Scales

Every model

Export