What color is #285378?

#285378 is a dark blue. In RGB it is rgb(40, 83, 120), and in HSL hsl(208, 50%, 31%).

Is #285378 accessible as text?

On white, #285378 has a contrast ratio of 8.08:1 (passes WCAG AA for body text); on black it is 2.60:1 (fails). For text placed on #285378, use white for the best readability.

What is the closest Tailwind color to #285378?

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

What colors go well with #285378?

#285378 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #774C28. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #285378 below.

Is #285378 good for buttons?

#285378 works well for buttons and highlights, but use white text on #285378 — black text only reaches 2.60:1, below the 4.5:1 needed for normal-size labels.

Is #285378 the same as CSS darkslategray?

No — #285378 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#285378 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #285378

Not just a swatch — here's how #285378 works with other colors. Named schemes with #285378 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #285378 Accent #A5C4C0 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Classic 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 #285378 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Classic 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 #285378 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4F7598

Classic 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 Classic Blue.

Vintage Leather Lead · 5 colors

Lead #285378 Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

Classic 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 #F6F4EF Accent #285378 Secondary #6B7987 Support #969386 Ink #16140F

Classic 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 Classic Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #285378 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 28/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 56/100

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 47/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 61/100

High

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

Brand distinctiveness 21/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 72/100

High

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

Surface fit 33/100

Low

Usable as a tinted surface in measured doses.

Print safety 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #285378

For UI

For branding

For interior

For fashion

People also use #285378 with

Dark Cyan Midnight Blue 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 8.1:1. Use

Subtle surface Use #CFDDE8 for cards and hover fills. Tint 80

Avoid beside #283777 — 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 #285378 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: #285378;
  --color-base-rgb: 40 83 120;
  --color-base-oklch: oklch(42.9% 0.078 246.8);
  --color-50: #F3F8FC;
  --color-100: #E0EBF5;
  --color-200: #C2D8EB;
  --color-300: #97BAD8;
  --color-400: #709CC2;
  --color-500: #4E7DA6;
  --color-600: #426380;
  --color-700: #33495C;
  --color-800: #24313C;
  --color-900: #181F25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F3F8FC',
    100: '#E0EBF5',
    200: '#C2D8EB',
    300: '#97BAD8',
    400: '#709CC2',
    500: '#4E7DA6',
    600: '#426380',
    700: '#33495C',
    800: '#24313C',
    900: '#181F25',
  },
}

$base: #285378;
$base-ink: #FFFFFF;
$base-50: #F3F8FC;
$base-100: #E0EBF5;
$base-200: #C2D8EB;
$base-300: #97BAD8;
$base-400: #709CC2;
$base-500: #4E7DA6;
$base-600: #426380;
$base-700: #33495C;
$base-800: #24313C;
$base-900: #181F25;
$base-hover: #20415F;
$base-subtle: #B6CCDE;

{
    "color": {
        "base": {
            "value": "#285378",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FC",
                "type": "color"
            },
            "100": {
                "value": "#E0EBF5",
                "type": "color"
            },
            "200": {
                "value": "#C2D8EB",
                "type": "color"
            },
            "300": {
                "value": "#97BAD8",
                "type": "color"
            },
            "400": {
                "value": "#709CC2",
                "type": "color"
            },
            "500": {
                "value": "#4E7DA6",
                "type": "color"
            },
            "600": {
                "value": "#426380",
                "type": "color"
            },
            "700": {
                "value": "#33495C",
                "type": "color"
            },
            "800": {
                "value": "#24313C",
                "type": "color"
            },
            "900": {
                "value": "#181F25",
                "type": "color"
            }
        }
    }
}