What color is #377CEA?

#377CEA is a medium, vivid blue. In RGB it is rgb(55, 124, 234), and in HSL hsl(217, 81%, 57%).

Is #377CEA accessible as text?

On white, #377CEA has a contrast ratio of 4.01:1 (fails WCAG AA for body text); on black it is 5.23:1 (passes). For text placed on #377CEA, use black for the best readability.

What is the closest Tailwind color to #377CEA?

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

What colors go well with #377CEA?

#377CEA pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EAA639. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #377CEA below.

Is #377CEA good for buttons?

#377CEA works well for buttons and highlights, but use black text on #377CEA — white text only reaches 4.01:1, below the 4.5:1 needed for normal-size labels.

Is #377CEA the same as CSS royalblue?

No — #377CEA is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#377CEA Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #377CEA

Not just a swatch — here's how #377CEA works with other colors. Named schemes with #377CEA in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #377CEA Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Azure opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Tech Product Signal · 5 colors

Signal #377CEA Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #64A4FF

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.

Vintage Leather Lead · 5 colors

Lead #377CEA Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Azure plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Berry & Cream Lead · 5 colors

Lead #377CEA Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA 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 #F6F4EF Accent #377CEA Secondary #94ADD4 Support #9D8F88 Ink #16140F

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.

Build a working theme in the generator →

Color Lab

How #377CEA 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 6/100

Cool

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

Softness 40/100

Moderate

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 44/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 49/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 86/100

Very high

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

Surface fit 17/100

Very low

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

Print safety 65/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #377CEA

For UI

For branding

For interior

For fashion

People also use #377CEA with

Turquoise Han Purple Marigold 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 4.6:1. Use

Subtle surface Use #DCE6F6 for cards and hover fills. Tint 80

Avoid beside #3941EA — 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 #377CEA 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: #377CEA;
  --color-base-rgb: 55 124 234;
  --color-base-oklch: oklch(60.1% 0.180 259.5);
  --color-50: #F1F6FE;
  --color-100: #D9E7FC;
  --color-200: #B5CFF7;
  --color-300: #83ABEC;
  --color-400: #5689DC;
  --color-500: #336AC2;
  --color-600: #2E5593;
  --color-700: #274068;
  --color-800: #1D2C44;
  --color-900: #141C2A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  azure: {
    50: '#F1F6FE',
    100: '#D9E7FC',
    200: '#B5CFF7',
    300: '#83ABEC',
    400: '#5689DC',
    500: '#336AC2',
    600: '#2E5593',
    700: '#274068',
    800: '#1D2C44',
    900: '#141C2A',
  },
}

$base: #377CEA;
$base-ink: #141310;
$base-50: #F1F6FE;
$base-100: #D9E7FC;
$base-200: #B5CFF7;
$base-300: #83ABEC;
$base-400: #5689DC;
$base-500: #336AC2;
$base-600: #2E5593;
$base-700: #274068;
$base-800: #1D2C44;
$base-900: #141C2A;
$base-hover: #165ED2;
$base-subtle: #CAD9F2;

{
    "color": {
        "base": {
            "value": "#377CEA",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F6FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E7FC",
                "type": "color"
            },
            "200": {
                "value": "#B5CFF7",
                "type": "color"
            },
            "300": {
                "value": "#83ABEC",
                "type": "color"
            },
            "400": {
                "value": "#5689DC",
                "type": "color"
            },
            "500": {
                "value": "#336AC2",
                "type": "color"
            },
            "600": {
                "value": "#2E5593",
                "type": "color"
            },
            "700": {
                "value": "#274068",
                "type": "color"
            },
            "800": {
                "value": "#1D2C44",
                "type": "color"
            },
            "900": {
                "value": "#141C2A",
                "type": "color"
            }
        }
    }
}

Palettes built on #377CEA

Color Lab

Pairs with #377CEA

UI roles & guardrails

In real applications

Scales

Every model

Export