What color is #2B4E51?

#2B4E51 is a dark, muted cyan. In RGB it is rgb(43, 78, 81), and in HSL hsl(185, 31%, 24%).

Is #2B4E51 accessible as text?

On white, #2B4E51 has a contrast ratio of 9.09:1 (passes WCAG AA for body text); on black it is 2.31:1 (fails). For text placed on #2B4E51, use white for the best readability.

What is the closest Tailwind color to #2B4E51?

The nearest Tailwind CSS token is teal-900 (#0B4F4A).

What colors go well with #2B4E51?

#2B4E51 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #502D2A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2B4E51 below.

Is #2B4E51 good for buttons?

#2B4E51 works well for buttons and highlights, but use white text on #2B4E51 — black text only reaches 2.31:1, below the 4.5:1 needed for normal-size labels.

Is #2B4E51 the same as CSS darkslategray?

No — #2B4E51 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#2B4E51 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2B4E51

Not just a swatch — here's how #2B4E51 works with other colors. Named schemes with #2B4E51 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #2B4E51 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

Dark Slate Gray 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 #2B4E51 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Dark Slate Gray 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 #2B4E51 Surface #14161A Highlight #F4F6F8 Secondary #596771 Accent #4F6F72

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

Vintage Leather Lead · 5 colors

Lead #2B4E51 Secondary #715017 Surface #E3DCC0 Accent #395143 Anchor #552340

Dark Slate Gray 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 #2B4E51 Secondary #657172 Support #979286 Ink #16140F

Dark Slate Gray 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 Dark Slate Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #2B4E51 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 40/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 57/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 5/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 36/100

Low

A faint retro warmth without tipping into sepia.

Luxury 61/100

High

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

Brand distinctiveness 16/100

Very low

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

UI accent fit 50/100

Moderate

Workable accent with care around contrast.

Surface fit 47/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 89/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #2B4E51

For UI

For branding

For interior

For fashion

People also use #2B4E51 with

Hunter Green Gunmetal Gray Espresso Platinum Dark Slate Gray

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 9.1:1. Use

Subtle surface Use #D0DFE1 for cards and hover fills. Tint 80

Avoid beside #2A4050 — 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 #2B4E51 at work across the surfaces designers actually ship.

Website / UI

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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: #2B4E51;
  --color-base-rgb: 43 78 81;
  --color-base-oklch: oklch(39.9% 0.041 202.7);
  --color-50: #F5FAFA;
  --color-100: #E4F0F1;
  --color-200: #CAE1E3;
  --color-300: #A4C8CC;
  --color-400: #7FAEB3;
  --color-500: #5F9196;
  --color-600: #4E7174;
  --color-700: #3B5254;
  --color-800: #293738;
  --color-900: #1A2223;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F5FAFA',
    100: '#E4F0F1',
    200: '#CAE1E3',
    300: '#A4C8CC',
    400: '#7FAEB3',
    500: '#5F9196',
    600: '#4E7174',
    700: '#3B5254',
    800: '#293738',
    900: '#1A2223',
  },
}

$base: #2B4E51;
$base-ink: #FFFFFF;
$base-50: #F5FAFA;
$base-100: #E4F0F1;
$base-200: #CAE1E3;
$base-300: #A4C8CC;
$base-400: #7FAEB3;
$base-500: #5F9196;
$base-600: #4E7174;
$base-700: #3B5254;
$base-800: #293738;
$base-900: #1A2223;
$base-hover: #223E40;
$base-subtle: #B7D0D3;

{
    "color": {
        "base": {
            "value": "#2B4E51",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5FAFA",
                "type": "color"
            },
            "100": {
                "value": "#E4F0F1",
                "type": "color"
            },
            "200": {
                "value": "#CAE1E3",
                "type": "color"
            },
            "300": {
                "value": "#A4C8CC",
                "type": "color"
            },
            "400": {
                "value": "#7FAEB3",
                "type": "color"
            },
            "500": {
                "value": "#5F9196",
                "type": "color"
            },
            "600": {
                "value": "#4E7174",
                "type": "color"
            },
            "700": {
                "value": "#3B5254",
                "type": "color"
            },
            "800": {
                "value": "#293738",
                "type": "color"
            },
            "900": {
                "value": "#1A2223",
                "type": "color"
            }
        }
    }
}

Palettes built on #2B4E51

Color Lab

Pairs with #2B4E51

UI roles & guardrails

In real applications

Scales

Every model

Export