What color is #403F43?

#403F43 is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(64, 63, 67), and in HSL hsl(255, 3%, 25%).

Is #403F43 accessible as text?

On white, #403F43 has a contrast ratio of 10.45:1 (passes WCAG AA for body text); on black it is 2.01:1 (fails). For text placed on #403F43, use white for the best readability.

What is the closest Tailwind color to #403F43?

The nearest Tailwind CSS token is zinc-700 (#3F3F46).

What colors go well with #403F43?

As a neutral, #403F43 pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #403F43 the same as CSS darkslategray?

No — #403F43 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.

#403F43 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #403F43

Not just a swatch — here's how #403F43 works with other colors. Named schemes with #403F43 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #403F43 Surface #14161A Highlight #F4F6F8 Secondary #5B6572 Accent #616064

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

Vintage Leather Lead · 5 colors

Lead #403F43 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.

Japanese Sand Base · 5 colors

Base #403F43 Surface #F2E8DD Highlight #F8F0E7 Secondary #BDADA1 Ink #2C2724

Charcoal sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Berry & Cream Lead · 5 colors

Lead #403F43 Surface #F5E6D7 Anchor #5C2140 Accent #E5C2C8 Secondary #332B2F

Charcoal sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #403F43 Secondary #666667 Support #9C9088 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.

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Color Lab

How #403F43 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 49/100

Neutral

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

Softness 40/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 58/100

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 60/100

High

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

Brand distinctiveness 3/100

Very low

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

UI accent fit 31/100

Low

Workable accent with care around contrast.

Surface fit 59/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 99/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #403F43

For UI

For branding

For interior

For fashion

People also use #403F43 with

Iron 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 10.4:1. Use

Subtle surface Use #D8D8DA for cards and hover fills. Tint 80

Avoid beside #403E42 — 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 #403F43 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: #403F43;
  --color-base-rgb: 64 63 67;
  --color-base-oklch: oklch(37.0% 0.007 297.5);
  --color-50: #F7F7F8;
  --color-100: #EAEAEB;
  --color-200: #D5D5D8;
  --color-300: #B6B5BA;
  --color-400: #97959D;
  --color-500: #78767F;
  --color-600: #5F5D65;
  --color-700: #46454A;
  --color-800: #2F2F32;
  --color-900: #1E1D20;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F7F7F8',
    100: '#EAEAEB',
    200: '#D5D5D8',
    300: '#B6B5BA',
    400: '#97959D',
    500: '#78767F',
    600: '#5F5D65',
    700: '#46454A',
    800: '#2F2F32',
    900: '#1E1D20',
  },
}

$base: #403F43;
$base-ink: #FFFFFF;
$base-50: #F7F7F8;
$base-100: #EAEAEB;
$base-200: #D5D5D8;
$base-300: #B6B5BA;
$base-400: #97959D;
$base-500: #78767F;
$base-600: #5F5D65;
$base-700: #46454A;
$base-800: #2F2F32;
$base-900: #1E1D20;
$base-hover: #323135;
$base-subtle: #C5C4C7;

{
    "color": {
        "base": {
            "value": "#403F43",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F7F7F8",
                "type": "color"
            },
            "100": {
                "value": "#EAEAEB",
                "type": "color"
            },
            "200": {
                "value": "#D5D5D8",
                "type": "color"
            },
            "300": {
                "value": "#B6B5BA",
                "type": "color"
            },
            "400": {
                "value": "#97959D",
                "type": "color"
            },
            "500": {
                "value": "#78767F",
                "type": "color"
            },
            "600": {
                "value": "#5F5D65",
                "type": "color"
            },
            "700": {
                "value": "#46454A",
                "type": "color"
            },
            "800": {
                "value": "#2F2F32",
                "type": "color"
            },
            "900": {
                "value": "#1E1D20",
                "type": "color"
            }
        }
    }
}

Palettes built on #403F43

Color Lab

Pairs with #403F43

UI roles & guardrails

In real applications

Scales

Every model

Export