What color is #403263?

#403263 is a dark, muted indigo. In RGB it is rgb(64, 50, 99), and in HSL hsl(257, 33%, 29%).

Is #403263 accessible as text?

On white, #403263 has a contrast ratio of 11.32:1 (passes WCAG AA for body text); on black it is 1.85:1 (fails). For text placed on #403263, use white for the best readability.

What is the closest Tailwind color to #403263?

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

What colors go well with #403263?

#403263 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #556232. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #403263 below.

Is #403263 good for buttons?

#403263 works well for buttons and highlights, but use white text on #403263 — black text only reaches 1.85:1, below the 4.5:1 needed for normal-size labels.

Is #403263 the same as CSS darkslateblue?

No — #403263 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) 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.

#403263 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #403263

Not just a swatch — here's how #403263 works with other colors. Named schemes with #403263 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #403263 Accent #A5C4C3 Surface #E9D6BF Secondary #9AA0A1 Anchor #23334A

Dark Slate Blue 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 #403263 Secondary #AFB4B8 Surface #F1F2F0 Support #7F92A7 Anchor #2E3236

Dark Slate Blue 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 #403263 Secondary #7E4632 Surface #EDD8C2 Accent #355248 Anchor #582237

Dark Slate Blue 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 #403263 Anchor #141210 Accent #DA9856 Secondary #292732 Surface #F3ECE3

Dark Slate Blue 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 #403263 Secondary #635F72 Support #9D9088 Ink #18140F

Dark Slate Blue 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 Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #403263 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 40/100

Neutral

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

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 49/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 32/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 52/100

Moderate

Workable accent with care around contrast.

Surface fit 36/100

Low

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 #403263

For UI

For branding

For interior

For fashion

People also use #403263 with

Classic Blue Byzantium Dark Olive Green Gainsboro Russian Violet

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 11.3:1. Use

Subtle surface Use #D7D2E3 for cards and hover fills. Tint 80

Avoid beside #503262 — 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 #403263 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: #403263;
  --color-base-rgb: 64 50 99;
  --color-base-oklch: oklch(35.7% 0.083 295.0);
  --color-50: #F6F5FA;
  --color-100: #E8E3F2;
  --color-200: #D0C9E4;
  --color-300: #AEA2CD;
  --color-400: #8D7EB4;
  --color-500: #6E5D97;
  --color-600: #584C75;
  --color-700: #423A55;
  --color-800: #2D2938;
  --color-900: #1D1A23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F6F5FA',
    100: '#E8E3F2',
    200: '#D0C9E4',
    300: '#AEA2CD',
    400: '#8D7EB4',
    500: '#6E5D97',
    600: '#584C75',
    700: '#423A55',
    800: '#2D2938',
    900: '#1D1A23',
  },
}

$base: #403263;
$base-ink: #FFFFFF;
$base-50: #F6F5FA;
$base-100: #E8E3F2;
$base-200: #D0C9E4;
$base-300: #AEA2CD;
$base-400: #8D7EB4;
$base-500: #6E5D97;
$base-600: #584C75;
$base-700: #423A55;
$base-800: #2D2938;
$base-900: #1D1A23;
$base-hover: #33284F;
$base-subtle: #C3BBD6;

{
    "color": {
        "base": {
            "value": "#403263",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E8E3F2",
                "type": "color"
            },
            "200": {
                "value": "#D0C9E4",
                "type": "color"
            },
            "300": {
                "value": "#AEA2CD",
                "type": "color"
            },
            "400": {
                "value": "#8D7EB4",
                "type": "color"
            },
            "500": {
                "value": "#6E5D97",
                "type": "color"
            },
            "600": {
                "value": "#584C75",
                "type": "color"
            },
            "700": {
                "value": "#423A55",
                "type": "color"
            },
            "800": {
                "value": "#2D2938",
                "type": "color"
            },
            "900": {
                "value": "#1D1A23",
                "type": "color"
            }
        }
    }
}