What color is #423279?

#423279 is a dark indigo. In RGB it is rgb(66, 50, 121), and in HSL hsl(254, 42%, 34%).

Is #423279 accessible as text?

On white, #423279 has a contrast ratio of 10.69:1 (passes WCAG AA for body text); on black it is 1.96:1 (fails). For text placed on #423279, use white for the best readability.

What is the closest Tailwind color to #423279?

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

What colors go well with #423279?

#423279 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #6A7B32. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #423279 below.

Is #423279 good for buttons?

#423279 works well for buttons and highlights, but use white text on #423279 — black text only reaches 1.96:1, below the 4.5:1 needed for normal-size labels.

Is #423279 the same as CSS darkslateblue?

No — #423279 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#423279 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #423279

Not just a swatch — here's how #423279 works with other colors. Named schemes with #423279 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #423279 Anchor #141210 Accent #DB9757 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 #423279 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DA Accent #2E1540

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 #423279 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 #423279 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 #423279 Secondary #67647E 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 #423279 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 44/100

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 45/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 64/100

High

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

Surface fit 25/100

Low

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

Print safety 84/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #423279

For UI

For branding

For interior

For fashion

People also use #423279 with

Lapis Lazuli Eminence 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 10.7:1. Use

Subtle surface Use #D8D3E8 for cards and hover fills. Tint 80

Avoid beside #5C327B — 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 #423279 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: #423279;
  --color-base-rgb: 66 50 121;
  --color-base-oklch: oklch(37.5% 0.116 290.0);
  --color-50: #F5F4FB;
  --color-100: #E6E2F4;
  --color-200: #CDC5E7;
  --color-300: #A99CD3;
  --color-400: #8676BC;
  --color-500: #67559F;
  --color-600: #53477B;
  --color-700: #3E3658;
  --color-800: #2B263B;
  --color-900: #1C1924;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F5F4FB',
    100: '#E6E2F4',
    200: '#CDC5E7',
    300: '#A99CD3',
    400: '#8676BC',
    500: '#67559F',
    600: '#53477B',
    700: '#3E3658',
    800: '#2B263B',
    900: '#1C1924',
  },
}

$base: #423279;
$base-ink: #FFFFFF;
$base-50: #F5F4FB;
$base-100: #E6E2F4;
$base-200: #CDC5E7;
$base-300: #A99CD3;
$base-400: #8676BC;
$base-500: #67559F;
$base-600: #53477B;
$base-700: #3E3658;
$base-800: #2B263B;
$base-900: #1C1924;
$base-hover: #362862;
$base-subtle: #C4BCDD;

{
    "color": {
        "base": {
            "value": "#423279",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E6E2F4",
                "type": "color"
            },
            "200": {
                "value": "#CDC5E7",
                "type": "color"
            },
            "300": {
                "value": "#A99CD3",
                "type": "color"
            },
            "400": {
                "value": "#8676BC",
                "type": "color"
            },
            "500": {
                "value": "#67559F",
                "type": "color"
            },
            "600": {
                "value": "#53477B",
                "type": "color"
            },
            "700": {
                "value": "#3E3658",
                "type": "color"
            },
            "800": {
                "value": "#2B263B",
                "type": "color"
            },
            "900": {
                "value": "#1C1924",
                "type": "color"
            }
        }
    }
}

Palettes built on #423279

Color Lab

Pairs with #423279

UI roles & guardrails

In real applications

Scales

Every model

Export