What color is #4240D6?

#4240D6 is a medium blue-violet. In RGB it is rgb(66, 64, 214), and in HSL hsl(241, 65%, 55%).

Is #4240D6 accessible as text?

On white, #4240D6 has a contrast ratio of 7.15:1 (passes WCAG AA for body text); on black it is 2.94:1 (fails). For text placed on #4240D6, use white for the best readability.

What is the closest Tailwind color to #4240D6?

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

What colors go well with #4240D6?

#4240D6 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D4D742. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #4240D6 below.

Is #4240D6 good for buttons?

#4240D6 works well for buttons and highlights, but use white text on #4240D6 — black text only reaches 2.94:1, below the 4.5:1 needed for normal-size labels.

Is #4240D6 the same as CSS slateblue?

No — #4240D6 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#4240D6 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #4240D6

Not just a swatch — here's how #4240D6 works with other colors. Named schemes with #4240D6 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #4240D6 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #616DF4

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.

Coastal Morning Lead · 5 colors

Lead #4240D6 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Cerulean 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 #4240D6 Surface #F6E5D8 Anchor #5B2143 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 #4240D6 Secondary #7882B5 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.

Sunset Warmth Glow · 5 colors

Glow #4240D6 Secondary #E86A72 Accent #F6924F Anchor #573B58 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 #4240D6 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 14/100

Cool

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

Softness 28/100

Low

Firm and assertive — carries weight and contrast.

Depth 57/100

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 17/100

Very low

Clean and current — no dusty, aged cast.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 85/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 74/100

High

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

Surface fit 9/100

Very low

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

Print safety 64/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #4240D6

For UI

For branding

For interior

For fashion

People also use #4240D6 with

Iceberg Dark Orchid Citrine 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 7.2:1. Use

Subtle surface Use #DEDDF3 for cards and hover fills. Tint 80

Avoid beside #7642D7 — 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 #4240D6 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: #4240D6;
  --color-base-rgb: 66 64 214;
  --color-base-oklch: oklch(47.9% 0.221 274.7);
  --color-50: #F2F2FD;
  --color-100: #DDDDF9;
  --color-200: #BDBCF1;
  --color-300: #8F8EE2;
  --color-400: #6563CF;
  --color-500: #4341B4;
  --color-600: #3A3889;
  --color-700: #2E2D62;
  --color-800: #212140;
  --color-900: #161627;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F2F2FD',
    100: '#DDDDF9',
    200: '#BDBCF1',
    300: '#8F8EE2',
    400: '#6563CF',
    500: '#4341B4',
    600: '#3A3889',
    700: '#2E2D62',
    800: '#212140',
    900: '#161627',
  },
}

$base: #4240D6;
$base-ink: #FFFFFF;
$base-50: #F2F2FD;
$base-100: #DDDDF9;
$base-200: #BDBCF1;
$base-300: #8F8EE2;
$base-400: #6563CF;
$base-500: #4341B4;
$base-600: #3A3889;
$base-700: #2E2D62;
$base-800: #212140;
$base-900: #161627;
$base-hover: #2A27B9;
$base-subtle: #CCCCEE;

{
    "color": {
        "base": {
            "value": "#4240D6",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F2FD",
                "type": "color"
            },
            "100": {
                "value": "#DDDDF9",
                "type": "color"
            },
            "200": {
                "value": "#BDBCF1",
                "type": "color"
            },
            "300": {
                "value": "#8F8EE2",
                "type": "color"
            },
            "400": {
                "value": "#6563CF",
                "type": "color"
            },
            "500": {
                "value": "#4341B4",
                "type": "color"
            },
            "600": {
                "value": "#3A3889",
                "type": "color"
            },
            "700": {
                "value": "#2E2D62",
                "type": "color"
            },
            "800": {
                "value": "#212140",
                "type": "color"
            },
            "900": {
                "value": "#161627",
                "type": "color"
            }
        }
    }
}

Palettes built on #4240D6

Color Lab

Pairs with #4240D6

UI roles & guardrails

In real applications

Scales

Every model

Export