What color is #284BBD?

#284BBD is a medium blue. In RGB it is rgb(40, 75, 189), and in HSL hsl(226, 65%, 45%).

Is #284BBD accessible as text?

On white, #284BBD has a contrast ratio of 7.42:1 (passes WCAG AA for body text); on black it is 2.83:1 (fails). For text placed on #284BBD, use white for the best readability.

What is the closest Tailwind color to #284BBD?

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

What colors go well with #284BBD?

#284BBD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BD9B28. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #284BBD below.

Is #284BBD good for buttons?

#284BBD works well for buttons and highlights, but use white text on #284BBD — black text only reaches 2.83:1, below the 4.5:1 needed for normal-size labels.

Is #284BBD the same as CSS darkslateblue?

No — #284BBD is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#284BBD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #284BBD

Not just a swatch — here's how #284BBD works with other colors. Named schemes with #284BBD in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #284BBD Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cerulean 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 #284BBD Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #4C73DC

Cerulean is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Cerulean.

Vintage Leather Lead · 5 colors

Lead #284BBD Secondary #7F4536 Surface #EED7C2 Accent #365246 Anchor #58223A

Cerulean 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 #284BBD Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Cerulean 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 #284BBD Secondary #6F80A8 Support #9D8F88 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #284BBD 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 10/100

Cool

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

Softness 31/100

Low

Firm and assertive — carries weight and contrast.

Depth 57/100

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 27/100

Low

A faint retro warmth without tipping into sepia.

Luxury 55/100

Moderate

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

Brand distinctiveness 50/100

Moderate

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 10/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #284BBD

For UI

For branding

For interior

For fashion

People also use #284BBD with

Picton Blue Grape Dijon 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 7.4:1. Use

Subtle surface Use #D6DCF0 for cards and hover fills. Tint 80

Avoid beside #3728BD — 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 #284BBD 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: #284BBD;
  --color-base-rgb: 40 75 189;
  --color-base-oklch: oklch(46.2% 0.184 266.1);
  --color-50: #F2F4FD;
  --color-100: #DDE3F9;
  --color-200: #BCC8F1;
  --color-300: #8EA1E2;
  --color-400: #637CCF;
  --color-500: #415CB4;
  --color-600: #384B89;
  --color-700: #2D3962;
  --color-800: #212840;
  --color-900: #161A27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F2F4FD',
    100: '#DDE3F9',
    200: '#BCC8F1',
    300: '#8EA1E2',
    400: '#637CCF',
    500: '#415CB4',
    600: '#384B89',
    700: '#2D3962',
    800: '#212840',
    900: '#161A27',
  },
}

$base: #284BBD;
$base-ink: #FFFFFF;
$base-50: #F2F4FD;
$base-100: #DDE3F9;
$base-200: #BCC8F1;
$base-300: #8EA1E2;
$base-400: #637CCF;
$base-500: #415CB4;
$base-600: #384B89;
$base-700: #2D3962;
$base-800: #212840;
$base-900: #161A27;
$base-hover: #203C97;
$base-subtle: #C0CAEA;

{
    "color": {
        "base": {
            "value": "#284BBD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F4FD",
                "type": "color"
            },
            "100": {
                "value": "#DDE3F9",
                "type": "color"
            },
            "200": {
                "value": "#BCC8F1",
                "type": "color"
            },
            "300": {
                "value": "#8EA1E2",
                "type": "color"
            },
            "400": {
                "value": "#637CCF",
                "type": "color"
            },
            "500": {
                "value": "#415CB4",
                "type": "color"
            },
            "600": {
                "value": "#384B89",
                "type": "color"
            },
            "700": {
                "value": "#2D3962",
                "type": "color"
            },
            "800": {
                "value": "#212840",
                "type": "color"
            },
            "900": {
                "value": "#161A27",
                "type": "color"
            }
        }
    }
}

Palettes built on #284BBD

Color Lab

Pairs with #284BBD

UI roles & guardrails

In real applications

Scales

Every model

Export