What color is #4378FF?

#4378FF is a light, vivid blue. In RGB it is rgb(67, 120, 255), and in HSL hsl(223, 100%, 63%).

Is #4378FF accessible as text?

On white, #4378FF has a contrast ratio of 3.91:1 (fails WCAG AA for body text); on black it is 5.37:1 (passes). For text placed on #4378FF, use black for the best readability.

What is the closest Tailwind color to #4378FF?

The nearest Tailwind CSS token is blue-500 (#2B7FFF).

What colors go well with #4378FF?

#4378FF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #FFCA42. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #4378FF below.

Is #4378FF good for buttons?

#4378FF works well for buttons and highlights, but use black text on #4378FF — white text only reaches 3.91:1, below the 4.5:1 needed for normal-size labels.

Is #4378FF the same as CSS royalblue?

No — #4378FF is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#4378FF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #4378FF

Not just a swatch — here's how #4378FF works with other colors. Named schemes with #4378FF in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #4378FF Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #6CA2FF

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

Coastal Morning Lead · 5 colors

Lead #4378FF Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Azure 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 #4378FF Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Azure 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 #4378FF Secondary #98AFDE Support #9D8F88 Ink #18140F

Azure 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 Azure carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #4378FF Secondary #E76A75 Accent #F79251 Anchor #573B58 Surface #F7E7D7

Azure 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 #4378FF 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 9/100

Cool

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

Softness 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 42/100

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 20/100

Low

Clean and current — no dusty, aged cast.

Luxury 41/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 81/100

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 18/100

Very low

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

Print safety 62/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #4378FF

For UI

For branding

For interior

For fashion

People also use #4378FF with

Electric Blue Violet Honey Gainsboro Charcoal

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AA

Body text Do not use for body copy on light surfaces. Avoid

Large display Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 4.7:1. Use

Subtle surface Use #DFE6FA for cards and hover fills. Tint 80

Avoid beside #4C42FF — 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 #4378FF 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: #4378FF;
  --color-base-rgb: 67 120 255;
  --color-base-oklch: oklch(61.2% 0.209 264.7);
  --color-50: #F0F4FE;
  --color-100: #D8E2FD;
  --color-200: #B1C6FC;
  --color-300: #779CF8;
  --color-400: #4675EC;
  --color-500: #2254D2;
  --color-600: #23469F;
  --color-700: #1F3670;
  --color-800: #182648;
  --color-900: #11192C;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  azure: {
    50: '#F0F4FE',
    100: '#D8E2FD',
    200: '#B1C6FC',
    300: '#779CF8',
    400: '#4675EC',
    500: '#2254D2',
    600: '#23469F',
    700: '#1F3670',
    800: '#182648',
    900: '#11192C',
  },
}

$base: #4378FF;
$base-ink: #141310;
$base-50: #F0F4FE;
$base-100: #D8E2FD;
$base-200: #B1C6FC;
$base-300: #779CF8;
$base-400: #4675EC;
$base-500: #2254D2;
$base-600: #23469F;
$base-700: #1F3670;
$base-800: #182648;
$base-900: #11192C;
$base-hover: #024AFF;
$base-subtle: #CDD9F8;

{
    "color": {
        "base": {
            "value": "#4378FF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E2FD",
                "type": "color"
            },
            "200": {
                "value": "#B1C6FC",
                "type": "color"
            },
            "300": {
                "value": "#779CF8",
                "type": "color"
            },
            "400": {
                "value": "#4675EC",
                "type": "color"
            },
            "500": {
                "value": "#2254D2",
                "type": "color"
            },
            "600": {
                "value": "#23469F",
                "type": "color"
            },
            "700": {
                "value": "#1F3670",
                "type": "color"
            },
            "800": {
                "value": "#182648",
                "type": "color"
            },
            "900": {
                "value": "#11192C",
                "type": "color"
            }
        }
    }
}