What color is #284B40?

#284B40 is a dark, muted teal-green. In RGB it is rgb(40, 75, 64), and in HSL hsl(161, 30%, 23%).

Is #284B40 accessible as text?

On white, #284B40 has a contrast ratio of 9.67:1 (passes WCAG AA for body text); on black it is 2.17:1 (fails). For text placed on #284B40, use white for the best readability.

What is the closest Tailwind color to #284B40?

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

What colors go well with #284B40?

#284B40 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4C2934. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #284B40 below.

Is #284B40 good for buttons?

#284B40 works well for buttons and highlights, but use white text on #284B40 — black text only reaches 2.17:1, below the 4.5:1 needed for normal-size labels.

Is #284B40 the same as CSS darkslategray?

No — #284B40 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#284B40 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #284B40

Not just a swatch — here's how #284B40 works with other colors. Named schemes with #284B40 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #284B40 Accent #A7C4BC Surface #E1D9BE Secondary #9AA0A0 Anchor #1B3549

Brunswick Green 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 #284B40 Secondary #ADB4B7 Surface #F1F2F0 Support #7994A4 Anchor #2D3236

Brunswick Green keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Vintage Leather Lead · 5 colors

Lead #284B40 Secondary #734F19 Surface #E5DBC0 Accent #3B5141 Anchor #5B231F

Brunswick Green plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Modern Café Dominant · 5 colors

Dominant #284B40 Anchor #382B1E Surface #ECE4D0 Accent #849C6F Secondary #3A3833

Brunswick Green anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #284B40 Secondary #616D68 Support #989286 Ink #16140F

Brunswick Green 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 Brunswick Green carrying the quiet middle.

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Color Lab

How #284B40 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 43/100

Neutral

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 59/100

Moderate

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

Naturalness 30/100

Low

Loosely natural — an earthy edge without being rustic.

Vintage feel 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 62/100

High

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

Brand distinctiveness 17/100

Very low

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

UI accent fit 47/100

Moderate

Workable accent with care around contrast.

Surface fit 46/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 91/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #284B40

For UI

For branding

For interior

For fashion

People also use #284B40 with

Hunter Green Charcoal Bistre 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 9.7:1. Use

Subtle surface Use #CFE0DB for cards and hover fills. Tint 80

Avoid beside #294C4C — 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 #284B40 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

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Export

:root {
  --color-base: #284B40;
  --color-base-rgb: 40 75 64;
  --color-base-oklch: oklch(38.3% 0.045 171.5);
  --color-50: #F5FAF8;
  --color-100: #E4F1ED;
  --color-200: #CAE2DB;
  --color-300: #A4CBBF;
  --color-400: #80B2A2;
  --color-500: #609584;
  --color-600: #4E7468;
  --color-700: #3B544C;
  --color-800: #293833;
  --color-900: #1B2320;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  brunswick-green: {
    50: '#F5FAF8',
    100: '#E4F1ED',
    200: '#CAE2DB',
    300: '#A4CBBF',
    400: '#80B2A2',
    500: '#609584',
    600: '#4E7468',
    700: '#3B544C',
    800: '#293833',
    900: '#1B2320',
  },
}

$base: #284B40;
$base-ink: #FFFFFF;
$base-50: #F5FAF8;
$base-100: #E4F1ED;
$base-200: #CAE2DB;
$base-300: #A4CBBF;
$base-400: #80B2A2;
$base-500: #609584;
$base-600: #4E7468;
$base-700: #3B544C;
$base-800: #293833;
$base-900: #1B2320;
$base-hover: #213D34;
$base-subtle: #B7D2C9;

{
    "color": {
        "base": {
            "value": "#284B40",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5FAF8",
                "type": "color"
            },
            "100": {
                "value": "#E4F1ED",
                "type": "color"
            },
            "200": {
                "value": "#CAE2DB",
                "type": "color"
            },
            "300": {
                "value": "#A4CBBF",
                "type": "color"
            },
            "400": {
                "value": "#80B2A2",
                "type": "color"
            },
            "500": {
                "value": "#609584",
                "type": "color"
            },
            "600": {
                "value": "#4E7468",
                "type": "color"
            },
            "700": {
                "value": "#3B544C",
                "type": "color"
            },
            "800": {
                "value": "#293833",
                "type": "color"
            },
            "900": {
                "value": "#1B2320",
                "type": "color"
            }
        }
    }
}

Palettes built on #284B40

Color Lab

Pairs with #284B40

UI roles & guardrails

In real applications

Scales

Every model

Export