What color is #378EA4?

#378EA4 is a medium cyan. In RGB it is rgb(55, 142, 164), and in HSL hsl(192, 50%, 43%).

Is #378EA4 accessible as text?

On white, #378EA4 has a contrast ratio of 3.77:1 (fails WCAG AA for body text); on black it is 5.57:1 (passes). For text placed on #378EA4, use black for the best readability.

What is the closest Tailwind color to #378EA4?

The nearest Tailwind CSS token is cyan-600 (#0092B8).

What colors go well with #378EA4?

#378EA4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A44D37. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #378EA4 below.

Is #378EA4 good for buttons?

#378EA4 works well for buttons and highlights, but use black text on #378EA4 — white text only reaches 3.77:1, below the 4.5:1 needed for normal-size labels.

Is #378EA4 the same as CSS darkcyan?

No — #378EA4 is not the CSS named color darkcyan, but darkcyan (#008B8B) is the closest CSS named color.

#378EA4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #378EA4

Not just a swatch — here's how #378EA4 works with other colors. Named schemes with #378EA4 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #378EA4 Accent #A6C4BF Surface #DFDABF Secondary #9AA0A0 Anchor #1E3549

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

Nordic Calm Accent · 5 colors

Accent #378EA4 Secondary #AEB4B8 Surface #F1F2F0 Support #7B94A5 Anchor #2E3236

Bondi Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #378EA4 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #68B2C7

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

Vintage Leather Lead · 5 colors

Lead #378EA4 Secondary #705116 Surface #E3DCC0 Accent #395244 Anchor #56233E

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

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #378EA4 Secondary #97B1B9 Support #969386 Ink #16140F

Bondi Blue 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 Bondi Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #378EA4 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 24/100

Cool

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

Softness 52/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 39/100

Low

Mid depth — usable as an accent or a muted ground.

Naturalness 2/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 55/100

Moderate

Faded, nostalgic quality — editorial, heritage and retro work.

Luxury 46/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 24/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 81/100

Very high

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

Surface fit 36/100

Low

Usable as a tinted surface in measured doses.

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #378EA4

For UI

For branding

For interior

For fashion

People also use #378EA4 with

Emerald Green Cerulean Sienna Platinum Dark Slate Gray

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 4.9:1. Use

Subtle surface Use #D7E8EC for cards and hover fills. Tint 80

Avoid beside #376AA4 — 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 #378EA4 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: #378EA4;
  --color-base-rgb: 55 142 164;
  --color-base-oklch: oklch(60.4% 0.088 217.6);
  --color-50: #F3FAFC;
  --color-100: #E0F1F5;
  --color-200: #C2E2EB;
  --color-300: #97CBD8;
  --color-400: #70B2C2;
  --color-500: #4E95A6;
  --color-600: #427480;
  --color-700: #33545C;
  --color-800: #24383C;
  --color-900: #182325;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  bondi-blue: {
    50: '#F3FAFC',
    100: '#E0F1F5',
    200: '#C2E2EB',
    300: '#97CBD8',
    400: '#70B2C2',
    500: '#4E95A6',
    600: '#427480',
    700: '#33545C',
    800: '#24383C',
    900: '#182325',
  },
}

$base: #378EA4;
$base-ink: #141310;
$base-50: #F3FAFC;
$base-100: #E0F1F5;
$base-200: #C2E2EB;
$base-300: #97CBD8;
$base-400: #70B2C2;
$base-500: #4E95A6;
$base-600: #427480;
$base-700: #33545C;
$base-800: #24383C;
$base-900: #182325;
$base-hover: #2C7284;
$base-subtle: #C3DDE4;

{
    "color": {
        "base": {
            "value": "#378EA4",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3FAFC",
                "type": "color"
            },
            "100": {
                "value": "#E0F1F5",
                "type": "color"
            },
            "200": {
                "value": "#C2E2EB",
                "type": "color"
            },
            "300": {
                "value": "#97CBD8",
                "type": "color"
            },
            "400": {
                "value": "#70B2C2",
                "type": "color"
            },
            "500": {
                "value": "#4E95A6",
                "type": "color"
            },
            "600": {
                "value": "#427480",
                "type": "color"
            },
            "700": {
                "value": "#33545C",
                "type": "color"
            },
            "800": {
                "value": "#24383C",
                "type": "color"
            },
            "900": {
                "value": "#182325",
                "type": "color"
            }
        }
    }
}

Palettes built on #378EA4

Color Lab

Pairs with #378EA4

UI roles & guardrails

In real applications

Scales

Every model

Export