What color is #423FA7?

#423FA7 is a medium blue-violet. In RGB it is rgb(66, 63, 167), and in HSL hsl(242, 45%, 45%).

Is #423FA7 accessible as text?

On white, #423FA7 has a contrast ratio of 8.40:1 (passes WCAG AA for body text); on black it is 2.50:1 (fails). For text placed on #423FA7, use white for the best readability.

What is the closest Tailwind color to #423FA7?

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

What colors go well with #423FA7?

#423FA7 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A3A63F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #423FA7 below.

Is #423FA7 good for buttons?

#423FA7 works well for buttons and highlights, but use white text on #423FA7 — black text only reaches 2.50:1, below the 4.5:1 needed for normal-size labels.

Is #423FA7 the same as CSS darkslateblue?

No — #423FA7 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#423FA7 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #423FA7

Not just a swatch — here's how #423FA7 works with other colors. Named schemes with #423FA7 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #423FA7 Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #22344A

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 #423FA7 Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582239

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.

Modern Café Dominant · 5 colors

Dominant #423FA7 Anchor #3B2923 Surface #F3E1D2 Accent #769F7B Secondary #3C3734

Dark Slate Blue anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Berry & Cream Lead · 5 colors

Lead #423FA7 Surface #F6E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #322B2F

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 #423FA7 Secondary #71769B 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 #423FA7 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 18/100

Cool

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

Softness 32/100

Low

Firm and assertive — carries weight and contrast.

Depth 59/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 59/100

Moderate

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

Brand distinctiveness 44/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 84/100

Very high

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

Surface fit 12/100

Very low

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

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #423FA7

For UI

For branding

For interior

For fashion

People also use #423FA7 with

Ocean Blue Royal Purple Citron 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 8.4:1. Use

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

Avoid beside #653FA6 — 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 #423FA7 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: #423FA7;
  --color-base-rgb: 66 63 167;
  --color-base-oklch: oklch(43.5% 0.162 278.5);
  --color-50: #F4F4FB;
  --color-100: #E2E1F4;
  --color-200: #C5C4E8;
  --color-300: #9C9BD5;
  --color-400: #7674BE;
  --color-500: #5553A2;
  --color-600: #47457D;
  --color-700: #36355A;
  --color-800: #26263B;
  --color-900: #191925;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F4F4FB',
    100: '#E2E1F4',
    200: '#C5C4E8',
    300: '#9C9BD5',
    400: '#7674BE',
    500: '#5553A2',
    600: '#47457D',
    700: '#36355A',
    800: '#26263B',
    900: '#191925',
  },
}

$base: #423FA7;
$base-ink: #FFFFFF;
$base-50: #F4F4FB;
$base-100: #E2E1F4;
$base-200: #C5C4E8;
$base-300: #9C9BD5;
$base-400: #7674BE;
$base-500: #5553A2;
$base-600: #47457D;
$base-700: #36355A;
$base-800: #26263B;
$base-900: #191925;
$base-hover: #353285;
$base-subtle: #C7C7E3;

{
    "color": {
        "base": {
            "value": "#423FA7",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E2E1F4",
                "type": "color"
            },
            "200": {
                "value": "#C5C4E8",
                "type": "color"
            },
            "300": {
                "value": "#9C9BD5",
                "type": "color"
            },
            "400": {
                "value": "#7674BE",
                "type": "color"
            },
            "500": {
                "value": "#5553A2",
                "type": "color"
            },
            "600": {
                "value": "#47457D",
                "type": "color"
            },
            "700": {
                "value": "#36355A",
                "type": "color"
            },
            "800": {
                "value": "#26263B",
                "type": "color"
            },
            "900": {
                "value": "#191925",
                "type": "color"
            }
        }
    }
}

Palettes built on #423FA7

Color Lab

Pairs with #423FA7

UI roles & guardrails

In real applications

Scales

Every model

Export