What color is #403276?

#403276 is a dark indigo. In RGB it is rgb(64, 50, 118), and in HSL hsl(252, 40%, 33%).

Is #403276 accessible as text?

On white, #403276 has a contrast ratio of 10.85:1 (passes WCAG AA for body text); on black it is 1.94:1 (fails). For text placed on #403276, use white for the best readability.

What is the closest Tailwind color to #403276?

The nearest Tailwind CSS token is indigo-900 (#312C85).

What colors go well with #403276?

#403276 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #687632. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #403276 below.

Is #403276 good for buttons?

#403276 works well for buttons and highlights, but use white text on #403276 — black text only reaches 1.94:1, below the 4.5:1 needed for normal-size labels.

Is #403276 the same as CSS darkslateblue?

No — #403276 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#403276 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #403276

Not just a swatch — here's how #403276 works with other colors. Named schemes with #403276 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #403276 Anchor #141210 Accent #DB9757 Secondary #282732 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.

Moody Editorial Color · 5 colors

Color #403276 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DA Accent #2C153E

Dark Slate Blue adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Dark Slate Blue.

Coastal Morning Lead · 5 colors

Lead #403276 Accent #A5C4C3 Surface #E9D6BF Secondary #9AA0A1 Anchor #22334A

Dark Slate Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Vintage Leather Lead · 5 colors

Lead #403276 Secondary #7E4633 Surface #EDD8C2 Accent #355248 Anchor #582238

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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #403276 Secondary #65637C 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 #403276 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 33/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 32/100

Low

Firm and assertive — carries weight and contrast.

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 45/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 43/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 62/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 27/100

Low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #403276

For UI

For branding

For interior

For fashion

People also use #403276 with

Lapis Lazuli Eminence Fern Green Gainsboro Prussian Blue

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 10.8:1. Use

Subtle surface Use #D7D3E7 for cards and hover fills. Tint 80

Avoid beside #563276 — 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 #403276 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

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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: #403276;
  --color-base-rgb: 64 50 118;
  --color-base-oklch: oklch(37.0% 0.112 289.3);
  --color-50: #F5F4FB;
  --color-100: #E5E2F3;
  --color-200: #CCC6E6;
  --color-300: #A89ED1;
  --color-400: #8578BA;
  --color-500: #65579E;
  --color-600: #52487A;
  --color-700: #3E3758;
  --color-800: #2B273A;
  --color-900: #1B1924;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F5F4FB',
    100: '#E5E2F3',
    200: '#CCC6E6',
    300: '#A89ED1',
    400: '#8578BA',
    500: '#65579E',
    600: '#52487A',
    700: '#3E3758',
    800: '#2B273A',
    900: '#1B1924',
  },
}

$base: #403276;
$base-ink: #FFFFFF;
$base-50: #F5F4FB;
$base-100: #E5E2F3;
$base-200: #CCC6E6;
$base-300: #A89ED1;
$base-400: #8578BA;
$base-500: #65579E;
$base-600: #52487A;
$base-700: #3E3758;
$base-800: #2B273A;
$base-900: #1B1924;
$base-hover: #33285E;
$base-subtle: #C2BCDB;

{
    "color": {
        "base": {
            "value": "#403276",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E5E2F3",
                "type": "color"
            },
            "200": {
                "value": "#CCC6E6",
                "type": "color"
            },
            "300": {
                "value": "#A89ED1",
                "type": "color"
            },
            "400": {
                "value": "#8578BA",
                "type": "color"
            },
            "500": {
                "value": "#65579E",
                "type": "color"
            },
            "600": {
                "value": "#52487A",
                "type": "color"
            },
            "700": {
                "value": "#3E3758",
                "type": "color"
            },
            "800": {
                "value": "#2B273A",
                "type": "color"
            },
            "900": {
                "value": "#1B1924",
                "type": "color"
            }
        }
    }
}

Palettes built on #403276

Color Lab

Pairs with #403276

UI roles & guardrails

In real applications

Scales

Every model

Export