What color is #255684?

#255684 is a dark blue. In RGB it is rgb(37, 86, 132), and in HSL hsl(209, 56%, 33%).

Is #255684 accessible as text?

On white, #255684 has a contrast ratio of 7.66:1 (passes WCAG AA for body text); on black it is 2.74:1 (fails). For text placed on #255684, use white for the best readability.

What is the closest Tailwind color to #255684?

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

What colors go well with #255684?

#255684 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #835325. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #255684 below.

Is #255684 good for buttons?

#255684 works well for buttons and highlights, but use white text on #255684 — black text only reaches 2.74:1, below the 4.5:1 needed for normal-size labels.

Is #255684 the same as CSS darkslateblue?

No — #255684 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#255684 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #255684

Not just a swatch — here's how #255684 works with other colors. Named schemes with #255684 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #255684 Accent #A5C4C1 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.

Tech Product Signal · 5 colors

Signal #255684 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4D79A4

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 #255684 Secondary #7F4538 Surface #E1DDC0 Accent #375245 Anchor #57233B

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.

Berry & Cream Lead · 5 colors

Lead #255684 Surface #EDE9D6 Anchor #5A2245 Accent #E4C2CB Secondary #322B2F

Classic Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #255684 Secondary #6D7D8E Support #959386 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 #255684 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 24/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 55/100

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 50/100

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 25/100

Low

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

UI accent fit 80/100

High

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

Surface fit 28/100

Low

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

Print safety 80/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #255684

For UI

For branding

For interior

For fashion

People also use #255684 with

Persian Green Midnight Blue Russet 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 7.7:1. Use

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

Avoid beside #253683 — 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 #255684 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: #255684;
  --color-base-rgb: 37 86 132;
  --color-base-oklch: oklch(44.3% 0.093 249.5);
  --color-50: #F3F8FC;
  --color-100: #DFEBF7;
  --color-200: #BFD7ED;
  --color-300: #93B9DC;
  --color-400: #6B9BC7;
  --color-500: #497CAC;
  --color-600: #3E6284;
  --color-700: #31485E;
  --color-800: #23313E;
  --color-900: #171F26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F3F8FC',
    100: '#DFEBF7',
    200: '#BFD7ED',
    300: '#93B9DC',
    400: '#6B9BC7',
    500: '#497CAC',
    600: '#3E6284',
    700: '#31485E',
    800: '#23313E',
    900: '#171F26',
  },
}

$base: #255684;
$base-ink: #FFFFFF;
$base-50: #F3F8FC;
$base-100: #DFEBF7;
$base-200: #BFD7ED;
$base-300: #93B9DC;
$base-400: #6B9BC7;
$base-500: #497CAC;
$base-600: #3E6284;
$base-700: #31485E;
$base-800: #23313E;
$base-900: #171F26;
$base-hover: #1E4569;
$base-subtle: #B6CCE2;

{
    "color": {
        "base": {
            "value": "#255684",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FC",
                "type": "color"
            },
            "100": {
                "value": "#DFEBF7",
                "type": "color"
            },
            "200": {
                "value": "#BFD7ED",
                "type": "color"
            },
            "300": {
                "value": "#93B9DC",
                "type": "color"
            },
            "400": {
                "value": "#6B9BC7",
                "type": "color"
            },
            "500": {
                "value": "#497CAC",
                "type": "color"
            },
            "600": {
                "value": "#3E6284",
                "type": "color"
            },
            "700": {
                "value": "#31485E",
                "type": "color"
            },
            "800": {
                "value": "#23313E",
                "type": "color"
            },
            "900": {
                "value": "#171F26",
                "type": "color"
            }
        }
    }
}

Palettes built on #255684

Color Lab

Pairs with #255684

UI roles & guardrails

In real applications

Scales

Every model

Export