What color is #403A43?

#403A43 is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(64, 58, 67), and in HSL hsl(280, 7%, 25%).

Is #403A43 accessible as text?

On white, #403A43 has a contrast ratio of 11.03:1 (passes WCAG AA for body text); on black it is 1.90:1 (fails). For text placed on #403A43, use white for the best readability.

What is the closest Tailwind color to #403A43?

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

What colors go well with #403A43?

As a neutral, #403A43 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 #403A43 the same as CSS darkslategray?

No — #403A43 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.

#403A43 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #403A43

Not just a swatch — here's how #403A43 works with other colors. Named schemes with #403A43 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #403A43 Surface #14161A Highlight #F4F6F8 Secondary #5C6573 Accent #605B63

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 #403A43 Secondary #7E4630 Surface #ECD8C1 Accent #355249 Anchor #592235

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.

Japanese Sand Base · 5 colors

Base #403A43 Surface #F1E8DC Highlight #F7F0E7 Secondary #BDADA1 Ink #2C2723

Onyx 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 #403A43 Surface #F5E6D7 Anchor #5D203F Accent #E5C2C6 Secondary #332B2F

Onyx 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 #403A43 Secondary #646265 Support #9C9087 Ink #18140F

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 #403A43 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 50/100

Neutral

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 60/100

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 34/100

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 7/100

Very low

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

UI accent fit 32/100

Low

Workable accent with care around contrast.

Surface fit 56/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 98/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #403A43

For UI

For branding

For interior

For fashion

People also use #403A43 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 11.0:1. Use

Subtle surface Use #D9D7DB for cards and hover fills. Tint 80

Avoid beside #443B44 — 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 #403A43 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: #403A43;
  --color-base-rgb: 64 58 67;
  --color-base-oklch: oklch(35.8% 0.017 314.6);
  --color-50: #F8F7F8;
  --color-100: #EBE9EC;
  --color-200: #D7D3D9;
  --color-300: #B9B3BC;
  --color-400: #9B939F;
  --color-500: #7C7481;
  --color-600: #625D65;
  --color-700: #48454A;
  --color-800: #312F32;
  --color-900: #1F1D20;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F8F7F8',
    100: '#EBE9EC',
    200: '#D7D3D9',
    300: '#B9B3BC',
    400: '#9B939F',
    500: '#7C7481',
    600: '#625D65',
    700: '#48454A',
    800: '#312F32',
    900: '#1F1D20',
  },
}

$base: #403A43;
$base-ink: #FFFFFF;
$base-50: #F8F7F8;
$base-100: #EBE9EC;
$base-200: #D7D3D9;
$base-300: #B9B3BC;
$base-400: #9B939F;
$base-500: #7C7481;
$base-600: #625D65;
$base-700: #48454A;
$base-800: #312F32;
$base-900: #1F1D20;
$base-hover: #342F37;
$base-subtle: #C7C3C9;

{
    "color": {
        "base": {
            "value": "#403A43",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F8F7F8",
                "type": "color"
            },
            "100": {
                "value": "#EBE9EC",
                "type": "color"
            },
            "200": {
                "value": "#D7D3D9",
                "type": "color"
            },
            "300": {
                "value": "#B9B3BC",
                "type": "color"
            },
            "400": {
                "value": "#9B939F",
                "type": "color"
            },
            "500": {
                "value": "#7C7481",
                "type": "color"
            },
            "600": {
                "value": "#625D65",
                "type": "color"
            },
            "700": {
                "value": "#48454A",
                "type": "color"
            },
            "800": {
                "value": "#312F32",
                "type": "color"
            },
            "900": {
                "value": "#1F1D20",
                "type": "color"
            }
        }
    }
}