What color is #2D528B?

#2D528B is a dark blue. In RGB it is rgb(45, 82, 139), and in HSL hsl(216, 51%, 36%).

Is #2D528B accessible as text?

On white, #2D528B has a contrast ratio of 7.80:1 (passes WCAG AA for body text); on black it is 2.69:1 (fails). For text placed on #2D528B, use white for the best readability.

What is the closest Tailwind color to #2D528B?

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

What colors go well with #2D528B?

#2D528B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8B652D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2D528B below.

Is #2D528B good for buttons?

#2D528B works well for buttons and highlights, but use white text on #2D528B — black text only reaches 2.69:1, below the 4.5:1 needed for normal-size labels.

Is #2D528B the same as CSS darkslateblue?

No — #2D528B is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#2D528B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2D528B

Not just a swatch — here's how #2D528B works with other colors. Named schemes with #2D528B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #2D528B 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 #2D528B Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5275AB

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 #2D528B Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

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 #2D528B Surface #EDE9D6 Anchor #5A2144 Accent #E4C2CA 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 #2D528B Secondary #6E7B90 Support #9D8F89 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 #2D528B 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 23/100

Cool

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

Softness 38/100

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 48/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 62/100

High

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

Brand distinctiveness 28/100

Low

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

UI accent fit 82/100

Very high

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

Surface fit 25/100

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 #2D528B

For UI

For branding

For interior

For fashion

People also use #2D528B with

Cadet Blue Dark Slate Blue Raw Umber 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 7.8:1. Use

Subtle surface Use #D2DCEA for cards and hover fills. Tint 80

Avoid beside #2D338B — 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 #2D528B at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #2D528B;
  --color-base-rgb: 45 82 139;
  --color-base-oklch: oklch(44.1% 0.103 258.8);
  --color-50: #F3F6FC;
  --color-100: #E0E8F6;
  --color-200: #C1D2EB;
  --color-300: #97B1D9;
  --color-400: #6F91C3;
  --color-500: #4E71A7;
  --color-600: #415B81;
  --color-700: #33435C;
  --color-800: #242E3D;
  --color-900: #181D26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F3F6FC',
    100: '#E0E8F6',
    200: '#C1D2EB',
    300: '#97B1D9',
    400: '#6F91C3',
    500: '#4E71A7',
    600: '#415B81',
    700: '#33435C',
    800: '#242E3D',
    900: '#181D26',
  },
}

$base: #2D528B;
$base-ink: #FFFFFF;
$base-50: #F3F6FC;
$base-100: #E0E8F6;
$base-200: #C1D2EB;
$base-300: #97B1D9;
$base-400: #6F91C3;
$base-500: #4E71A7;
$base-600: #415B81;
$base-700: #33435C;
$base-800: #242E3D;
$base-900: #181D26;
$base-hover: #24426F;
$base-subtle: #BBCAE1;

{
    "color": {
        "base": {
            "value": "#2D528B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F6FC",
                "type": "color"
            },
            "100": {
                "value": "#E0E8F6",
                "type": "color"
            },
            "200": {
                "value": "#C1D2EB",
                "type": "color"
            },
            "300": {
                "value": "#97B1D9",
                "type": "color"
            },
            "400": {
                "value": "#6F91C3",
                "type": "color"
            },
            "500": {
                "value": "#4E71A7",
                "type": "color"
            },
            "600": {
                "value": "#415B81",
                "type": "color"
            },
            "700": {
                "value": "#33435C",
                "type": "color"
            },
            "800": {
                "value": "#242E3D",
                "type": "color"
            },
            "900": {
                "value": "#181D26",
                "type": "color"
            }
        }
    }
}