What color is #40375D?

#40375D is a dark, muted indigo. In RGB it is rgb(64, 55, 93), and in HSL hsl(254, 26%, 29%).

Is #40375D accessible as text?

On white, #40375D has a contrast ratio of 10.92:1 (passes WCAG AA for body text); on black it is 1.92:1 (fails). For text placed on #40375D, use white for the best readability.

What is the closest Tailwind color to #40375D?

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

What colors go well with #40375D?

#40375D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #545D37. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #40375D below.

Is #40375D good for buttons?

#40375D works well for buttons and highlights, but use white text on #40375D — black text only reaches 1.92:1, below the 4.5:1 needed for normal-size labels.

Is #40375D the same as CSS darkslateblue?

No — #40375D is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#40375D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #40375D

Not just a swatch — here's how #40375D works with other colors. Named schemes with #40375D in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #40375D Accent #A5C4C3 Surface #E9D6BF Secondary #9AA0A1 Anchor #23334A

Charcoal 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 #40375D Secondary #AFB4B8 Surface #F1F2F0 Support #7F92A7 Anchor #2E3236

Charcoal 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 #40375D Secondary #7E4632 Surface #EDD8C2 Accent #355248 Anchor #582237

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

Luxury Packaging Feature · 5 colors

Feature #40375D Anchor #141210 Accent #DA9856 Secondary #292732 Surface #F3ECE3

Charcoal carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #40375D Secondary #656270 Support #9D9088 Ink #18140F

Charcoal 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 Charcoal carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #40375D 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 41/100

Neutral

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

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 45/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 66/100

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 49/100

Moderate

Workable accent with care around contrast.

Surface fit 42/100

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 #40375D

For UI

For branding

For interior

For fashion

People also use #40375D with

Iron Gray Eggplant Ebony Gainsboro Gunmetal 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 10.9:1. Use

Subtle surface Use #D7D4E2 for cards and hover fills. Tint 80

Avoid beside #4D375D — 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 #40375D 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: #40375D;
  --color-base-rgb: 64 55 93;
  --color-base-oklch: oklch(36.4% 0.065 293.8);
  --color-50: #F6F5FA;
  --color-100: #E8E5F0;
  --color-200: #D1CCE1;
  --color-300: #AFA7C8;
  --color-400: #8E83AF;
  --color-500: #6E6491;
  --color-600: #585171;
  --color-700: #423D52;
  --color-800: #2D2A37;
  --color-900: #1D1B22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F6F5FA',
    100: '#E8E5F0',
    200: '#D1CCE1',
    300: '#AFA7C8',
    400: '#8E83AF',
    500: '#6E6491',
    600: '#585171',
    700: '#423D52',
    800: '#2D2A37',
    900: '#1D1B22',
  },
}

$base: #40375D;
$base-ink: #FFFFFF;
$base-50: #F6F5FA;
$base-100: #E8E5F0;
$base-200: #D1CCE1;
$base-300: #AFA7C8;
$base-400: #8E83AF;
$base-500: #6E6491;
$base-600: #585171;
$base-700: #423D52;
$base-800: #2D2A37;
$base-900: #1D1B22;
$base-hover: #332C4B;
$base-subtle: #C3BED3;

{
    "color": {
        "base": {
            "value": "#40375D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E8E5F0",
                "type": "color"
            },
            "200": {
                "value": "#D1CCE1",
                "type": "color"
            },
            "300": {
                "value": "#AFA7C8",
                "type": "color"
            },
            "400": {
                "value": "#8E83AF",
                "type": "color"
            },
            "500": {
                "value": "#6E6491",
                "type": "color"
            },
            "600": {
                "value": "#585171",
                "type": "color"
            },
            "700": {
                "value": "#423D52",
                "type": "color"
            },
            "800": {
                "value": "#2D2A37",
                "type": "color"
            },
            "900": {
                "value": "#1D1B22",
                "type": "color"
            }
        }
    }
}

Palettes built on #40375D

Color Lab

Pairs with #40375D

UI roles & guardrails

In real applications

Scales

Every model

Export