What color is #404EC9?

#404EC9 is a medium blue-violet. In RGB it is rgb(64, 78, 201), and in HSL hsl(234, 56%, 52%).

Is #404EC9 accessible as text?

On white, #404EC9 has a contrast ratio of 6.66:1 (passes WCAG AA for body text); on black it is 3.15:1 (fails). For text placed on #404EC9, use white for the best readability.

What is the closest Tailwind color to #404EC9?

The nearest Tailwind CSS token is blue-700 (#1447E6).

What colors go well with #404EC9?

#404EC9 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C9BB40. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #404EC9 below.

Is #404EC9 good for buttons?

#404EC9 works well for buttons and highlights, but use white text on #404EC9 — black text only reaches 3.15:1, below the 4.5:1 needed for normal-size labels.

Is #404EC9 the same as CSS slateblue?

No — #404EC9 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#404EC9 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #404EC9

Not just a swatch — here's how #404EC9 works with other colors. Named schemes with #404EC9 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #404EC9 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #6277E8

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 #404EC9 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 #404EC9 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 #404EC9 Secondary #7B87B2 Support #9D8F88 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 #404EC9 Secondary #E86A73 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 #404EC9 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 13/100

Cool

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 54/100

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 27/100

Low

A faint retro warmth without tipping into sepia.

Luxury 53/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 73/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 88/100

Very high

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

Surface fit 8/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #404EC9

For UI

For branding

For interior

For fashion

People also use #404EC9 with

Iceberg Blue Violet Dark Khaki Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

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 6.7:1. Use

Subtle surface Use #DDDFF0 for cards and hover fills. Tint 80

Avoid beside #6040C9 — 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 #404EC9 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: #404EC9;
  --color-base-rgb: 64 78 201;
  --color-base-oklch: oklch(48.9% 0.189 272.3);
  --color-50: #F3F4FC;
  --color-100: #DFE1F7;
  --color-200: #BFC4ED;
  --color-300: #939BDC;
  --color-400: #6B74C7;
  --color-500: #4953AC;
  --color-600: #3E4584;
  --color-700: #31355E;
  --color-800: #23263E;
  --color-900: #171926;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F3F4FC',
    100: '#DFE1F7',
    200: '#BFC4ED',
    300: '#939BDC',
    400: '#6B74C7',
    500: '#4953AC',
    600: '#3E4584',
    700: '#31355E',
    800: '#23263E',
    900: '#171926',
  },
}

$base: #404EC9;
$base-ink: #FFFFFF;
$base-50: #F3F4FC;
$base-100: #DFE1F7;
$base-200: #BFC4ED;
$base-300: #939BDC;
$base-400: #6B74C7;
$base-500: #4953AC;
$base-600: #3E4584;
$base-700: #31355E;
$base-800: #23263E;
$base-900: #171926;
$base-hover: #2F3BA5;
$base-subtle: #CBCEEA;

{
    "color": {
        "base": {
            "value": "#404EC9",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F4FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE1F7",
                "type": "color"
            },
            "200": {
                "value": "#BFC4ED",
                "type": "color"
            },
            "300": {
                "value": "#939BDC",
                "type": "color"
            },
            "400": {
                "value": "#6B74C7",
                "type": "color"
            },
            "500": {
                "value": "#4953AC",
                "type": "color"
            },
            "600": {
                "value": "#3E4584",
                "type": "color"
            },
            "700": {
                "value": "#31355E",
                "type": "color"
            },
            "800": {
                "value": "#23263E",
                "type": "color"
            },
            "900": {
                "value": "#171926",
                "type": "color"
            }
        }
    }
}