What color is #423BC4?

#423BC4 is a medium blue-violet. In RGB it is rgb(66, 59, 196), and in HSL hsl(243, 54%, 50%).

Is #423BC4 accessible as text?

On white, #423BC4 has a contrast ratio of 7.91:1 (passes WCAG AA for body text); on black it is 2.65:1 (fails). For text placed on #423BC4, use white for the best readability.

What is the closest Tailwind color to #423BC4?

The nearest Tailwind CSS token is indigo-700 (#432DD7).

What colors go well with #423BC4?

#423BC4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BDC43B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #423BC4 below.

Is #423BC4 good for buttons?

#423BC4 works well for buttons and highlights, but use white text on #423BC4 — black text only reaches 2.65:1, below the 4.5:1 needed for normal-size labels.

Is #423BC4 the same as CSS darkslateblue?

No — #423BC4 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#423BC4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #423BC4

Not just a swatch — here's how #423BC4 works with other colors. Named schemes with #423BC4 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #423BC4 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #6167E2

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

Berry & Cream Lead · 5 colors

Lead #423BC4 Surface #F6E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #322B2F

Cerulean 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 #423BC4 Secondary #737BA9 Support #9D9088 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #423BC4 Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #22344A

Cerulean 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 #423BC4 Secondary #E86A72 Accent #F6924E Anchor #583B57 Surface #F7E7D7

Cerulean 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 #423BC4 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 16/100

Cool

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

Softness 29/100

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 21/100

Low

Clean and current — no dusty, aged cast.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 79/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 77/100

High

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

Surface fit 10/100

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 #423BC4

For UI

For branding

For interior

For fashion

People also use #423BC4 with

Carolina Blue Dark Orchid Yellow 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 7.9:1. Use

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

Avoid beside #6F3BC4 — 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 #423BC4 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: #423BC4;
  --color-base-rgb: 66 59 196;
  --color-base-oklch: oklch(45.5% 0.204 276.8);
  --color-50: #F3F3FC;
  --color-100: #E0DFF6;
  --color-200: #C2C0EC;
  --color-300: #9895DA;
  --color-400: #716CC6;
  --color-500: #504BAA;
  --color-600: #433F83;
  --color-700: #34325D;
  --color-800: #25233D;
  --color-900: #181726;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F3F3FC',
    100: '#E0DFF6',
    200: '#C2C0EC',
    300: '#9895DA',
    400: '#716CC6',
    500: '#504BAA',
    600: '#433F83',
    700: '#34325D',
    800: '#25233D',
    900: '#181726',
  },
}

$base: #423BC4;
$base-ink: #FFFFFF;
$base-50: #F3F3FC;
$base-100: #E0DFF6;
$base-200: #C2C0EC;
$base-300: #9895DA;
$base-400: #716CC6;
$base-500: #504BAA;
$base-600: #433F83;
$base-700: #34325D;
$base-800: #25233D;
$base-900: #181726;
$base-hover: #342F9D;
$base-subtle: #CBC9E8;

{
    "color": {
        "base": {
            "value": "#423BC4",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F3FC",
                "type": "color"
            },
            "100": {
                "value": "#E0DFF6",
                "type": "color"
            },
            "200": {
                "value": "#C2C0EC",
                "type": "color"
            },
            "300": {
                "value": "#9895DA",
                "type": "color"
            },
            "400": {
                "value": "#716CC6",
                "type": "color"
            },
            "500": {
                "value": "#504BAA",
                "type": "color"
            },
            "600": {
                "value": "#433F83",
                "type": "color"
            },
            "700": {
                "value": "#34325D",
                "type": "color"
            },
            "800": {
                "value": "#25233D",
                "type": "color"
            },
            "900": {
                "value": "#181726",
                "type": "color"
            }
        }
    }
}

Palettes built on #423BC4

Color Lab

Pairs with #423BC4

UI roles & guardrails

In real applications

Scales

Every model

Export