What color is #402F72?

#402F72 is a dark indigo. In RGB it is rgb(64, 47, 114), and in HSL hsl(255, 42%, 32%).

Is #402F72 accessible as text?

On white, #402F72 has a contrast ratio of 11.24:1 (passes WCAG AA for body text); on black it is 1.87:1 (fails). For text placed on #402F72, use white for the best readability.

What is the closest Tailwind color to #402F72?

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

What colors go well with #402F72?

#402F72 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #63742F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #402F72 below.

Is #402F72 good for buttons?

#402F72 works well for buttons and highlights, but use white text on #402F72 — black text only reaches 1.87:1, below the 4.5:1 needed for normal-size labels.

Is #402F72 the same as CSS darkslateblue?

No — #402F72 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#402F72 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #402F72

Not just a swatch — here's how #402F72 works with other colors. Named schemes with #402F72 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #402F72 Anchor #141210 Accent #DA9857 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.

Moody Editorial Color · 5 colors

Color #402F72 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DA Accent #2B123B

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 #402F72 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.

Berry & Cream Lead · 5 colors

Lead #402F72 Surface #F5E5D7 Anchor #5C2141 Accent #E5C2C8 Secondary #332B2F

Dark Slate Blue 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 #402F72 Secondary #646079 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 #402F72 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 34/100

Cool

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

Softness 31/100

Low

Firm and assertive — carries weight and contrast.

Depth 64/100

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 70/100

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 59/100

Moderate

Workable accent with care around contrast.

Surface fit 28/100

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 #402F72

For UI

For branding

For interior

For fashion

People also use #402F72 with

Lapis Lazuli Eminence Fern 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 11.2:1. Use

Subtle surface Use #D7D2E7 for cards and hover fills. Tint 80

Avoid beside #572F74 — 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 #402F72 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: #402F72;
  --color-base-rgb: 64 47 114;
  --color-base-oklch: oklch(36.2% 0.111 291.6);
  --color-50: #F6F4FB;
  --color-100: #E6E2F4;
  --color-200: #CEC5E7;
  --color-300: #AA9CD3;
  --color-400: #8876BC;
  --color-500: #68559F;
  --color-600: #54477B;
  --color-700: #3F3658;
  --color-800: #2B263B;
  --color-900: #1C1924;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F6F4FB',
    100: '#E6E2F4',
    200: '#CEC5E7',
    300: '#AA9CD3',
    400: '#8876BC',
    500: '#68559F',
    600: '#54477B',
    700: '#3F3658',
    800: '#2B263B',
    900: '#1C1924',
  },
}

$base: #402F72;
$base-ink: #FFFFFF;
$base-50: #F6F4FB;
$base-100: #E6E2F4;
$base-200: #CEC5E7;
$base-300: #AA9CD3;
$base-400: #8876BC;
$base-500: #68559F;
$base-600: #54477B;
$base-700: #3F3658;
$base-800: #2B263B;
$base-900: #1C1924;
$base-hover: #34265D;
$base-subtle: #C3BADC;

{
    "color": {
        "base": {
            "value": "#402F72",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E6E2F4",
                "type": "color"
            },
            "200": {
                "value": "#CEC5E7",
                "type": "color"
            },
            "300": {
                "value": "#AA9CD3",
                "type": "color"
            },
            "400": {
                "value": "#8876BC",
                "type": "color"
            },
            "500": {
                "value": "#68559F",
                "type": "color"
            },
            "600": {
                "value": "#54477B",
                "type": "color"
            },
            "700": {
                "value": "#3F3658",
                "type": "color"
            },
            "800": {
                "value": "#2B263B",
                "type": "color"
            },
            "900": {
                "value": "#1C1924",
                "type": "color"
            }
        }
    }
}

Palettes built on #402F72

Color Lab

Pairs with #402F72

UI roles & guardrails

In real applications

Scales

Every model

Export