What color is #2C3A4E?

#2C3A4E is a dark, muted blue. In RGB it is rgb(44, 58, 78), and in HSL hsl(215, 28%, 24%).

Is #2C3A4E accessible as text?

On white, #2C3A4E has a contrast ratio of 11.52:1 (passes WCAG AA for body text); on black it is 1.82:1 (fails). For text placed on #2C3A4E, use white for the best readability.

What is the closest Tailwind color to #2C3A4E?

The nearest Tailwind CSS token is mauve-700 (#463947).

What colors go well with #2C3A4E?

#2C3A4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4E402C. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2C3A4E below.

Is #2C3A4E good for buttons?

#2C3A4E works well for buttons and highlights, but use white text on #2C3A4E — black text only reaches 1.82:1, below the 4.5:1 needed for normal-size labels.

Is #2C3A4E the same as CSS darkslategray?

No — #2C3A4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#2C3A4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2C3A4E

Not just a swatch — here's how #2C3A4E works with other colors. Named schemes with #2C3A4E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #2C3A4E Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Onyx 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 #2C3A4E Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Onyx 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 #2C3A4E Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4D5A6E

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

Vintage Leather Lead · 5 colors

Lead #2C3A4E Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57223B

Onyx 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 #2C3A4E Secondary #5A5F67 Support #9D8F89 Ink #16140F

Onyx 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 Onyx carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #2C3A4E 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 39/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

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 32/100

Low

A faint retro warmth without tipping into sepia.

Luxury 65/100

High

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

Brand distinctiveness 15/100

Very low

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

UI accent fit 37/100

Low

Workable accent with care around contrast.

Surface fit 50/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 92/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #2C3A4E

For UI

For branding

For interior

For fashion

People also use #2C3A4E with

Feldgrau Gunmetal Gray Taupe 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 11.5:1. Use

Subtle surface Use #D0D7E0 for cards and hover fills. Tint 80

Avoid beside #2C2F4E — 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 #2C3A4E 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: #2C3A4E;
  --color-base-rgb: 44 58 78;
  --color-base-oklch: oklch(34.5% 0.040 257.3);
  --color-50: #F5F7FA;
  --color-100: #E5EAF1;
  --color-200: #CBD4E2;
  --color-300: #A6B5CA;
  --color-400: #8295B0;
  --color-500: #627693;
  --color-600: #4F5E72;
  --color-700: #3C4653;
  --color-800: #2A2F37;
  --color-900: #1B1E22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F5F7FA',
    100: '#E5EAF1',
    200: '#CBD4E2',
    300: '#A6B5CA',
    400: '#8295B0',
    500: '#627693',
    600: '#4F5E72',
    700: '#3C4653',
    800: '#2A2F37',
    900: '#1B1E22',
  },
}

$base: #2C3A4E;
$base-ink: #FFFFFF;
$base-50: #F5F7FA;
$base-100: #E5EAF1;
$base-200: #CBD4E2;
$base-300: #A6B5CA;
$base-400: #8295B0;
$base-500: #627693;
$base-600: #4F5E72;
$base-700: #3C4653;
$base-800: #2A2F37;
$base-900: #1B1E22;
$base-hover: #232F3F;
$base-subtle: #B8C3D1;

{
    "color": {
        "base": {
            "value": "#2C3A4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F7FA",
                "type": "color"
            },
            "100": {
                "value": "#E5EAF1",
                "type": "color"
            },
            "200": {
                "value": "#CBD4E2",
                "type": "color"
            },
            "300": {
                "value": "#A6B5CA",
                "type": "color"
            },
            "400": {
                "value": "#8295B0",
                "type": "color"
            },
            "500": {
                "value": "#627693",
                "type": "color"
            },
            "600": {
                "value": "#4F5E72",
                "type": "color"
            },
            "700": {
                "value": "#3C4653",
                "type": "color"
            },
            "800": {
                "value": "#2A2F37",
                "type": "color"
            },
            "900": {
                "value": "#1B1E22",
                "type": "color"
            }
        }
    }
}