What color is #421CB5?

#421CB5 is a medium, vivid indigo. In RGB it is rgb(66, 28, 181), and in HSL hsl(255, 73%, 41%).

Is #421CB5 accessible as text?

On white, #421CB5 has a contrast ratio of 10.17:1 (passes WCAG AA for body text); on black it is 2.06:1 (fails). For text placed on #421CB5, use white for the best readability.

What is the closest Tailwind color to #421CB5?

The nearest Tailwind CSS token is indigo-800 (#372AAC).

What colors go well with #421CB5?

#421CB5 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8FB51C. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #421CB5 below.

Is #421CB5 good for buttons?

#421CB5 works well for buttons and highlights, but use white text on #421CB5 — black text only reaches 2.06:1, below the 4.5:1 needed for normal-size labels.

Is #421CB5 the same as CSS darkslateblue?

No — #421CB5 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#421CB5 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #421CB5

Not just a swatch — here's how #421CB5 works with other colors. Named schemes with #421CB5 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #421CB5 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5E50D3

Egyptian Blue is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Egyptian Blue.

Berry & Cream Lead · 5 colors

Lead #421CB5 Surface #F5E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #332B2F

Egyptian 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 #421CB5 Secondary #686A9A Support #9D9088 Ink #18140F

Egyptian 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 Egyptian Blue carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #421CB5 Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

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

Sunset Warmth Glow · 5 colors

Glow #421CB5 Secondary #E86A70 Accent #F5934D Anchor #583B57 Surface #F7E7D7

Egyptian Blue glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

Build a working theme in the generator →

Color Lab

How #421CB5 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 19/100

Cool

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

Softness 25/100

Low

Firm and assertive — carries weight and contrast.

Depth 65/100

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 17/100

Very low

Clean and current — no dusty, aged cast.

Luxury 58/100

Moderate

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

Brand distinctiveness 83/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 60/100

High

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

Surface fit 14/100

Very low

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

Print safety 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #421CB5

For UI

For branding

For interior

For fashion

People also use #421CB5 with

Denim Blue Dark Orchid Apple 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 10.2:1. Use

Subtle surface Use #D9D1F1 for cards and hover fills. Tint 80

Avoid beside #751CB5 — 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 #421CB5 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: #421CB5;
  --color-base-rgb: 66 28 181;
  --color-base-oklch: oklch(40.2% 0.215 282.2);
  --color-50: #F4F1FD;
  --color-100: #E3DBFA;
  --color-200: #C7B9F4;
  --color-300: #A088E7;
  --color-400: #7B5DD5;
  --color-500: #5A3ABB;
  --color-600: #4A338E;
  --color-700: #392A65;
  --color-800: #281F42;
  --color-900: #1A1528;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  egyptian-blue: {
    50: '#F4F1FD',
    100: '#E3DBFA',
    200: '#C7B9F4',
    300: '#A088E7',
    400: '#7B5DD5',
    500: '#5A3ABB',
    600: '#4A338E',
    700: '#392A65',
    800: '#281F42',
    900: '#1A1528',
  },
}

$base: #421CB5;
$base-ink: #FFFFFF;
$base-50: #F4F1FD;
$base-100: #E3DBFA;
$base-200: #C7B9F4;
$base-300: #A088E7;
$base-400: #7B5DD5;
$base-500: #5A3ABB;
$base-600: #4A338E;
$base-700: #392A65;
$base-800: #281F42;
$base-900: #1A1528;
$base-hover: #351791;
$base-subtle: #C5B9EB;

{
    "color": {
        "base": {
            "value": "#421CB5",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F1FD",
                "type": "color"
            },
            "100": {
                "value": "#E3DBFA",
                "type": "color"
            },
            "200": {
                "value": "#C7B9F4",
                "type": "color"
            },
            "300": {
                "value": "#A088E7",
                "type": "color"
            },
            "400": {
                "value": "#7B5DD5",
                "type": "color"
            },
            "500": {
                "value": "#5A3ABB",
                "type": "color"
            },
            "600": {
                "value": "#4A338E",
                "type": "color"
            },
            "700": {
                "value": "#392A65",
                "type": "color"
            },
            "800": {
                "value": "#281F42",
                "type": "color"
            },
            "900": {
                "value": "#1A1528",
                "type": "color"
            }
        }
    }
}

Palettes built on #421CB5

Color Lab

Pairs with #421CB5

UI roles & guardrails

In real applications

Scales

Every model

Export