What color is #375BDB?

#375BDB is a medium blue. In RGB it is rgb(55, 91, 219), and in HSL hsl(227, 69%, 54%).

Is #375BDB accessible as text?

On white, #375BDB has a contrast ratio of 5.70:1 (passes WCAG AA for body text); on black it is 3.68:1 (fails). For text placed on #375BDB, use white for the best readability.

What is the closest Tailwind color to #375BDB?

The nearest Tailwind CSS token is blue-600 (#155DFC).

What colors go well with #375BDB?

#375BDB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DBB839. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #375BDB below.

Is #375BDB good for buttons?

#375BDB works well for buttons and highlights, but use white text on #375BDB — black text only reaches 3.68:1, below the 4.5:1 needed for normal-size labels.

Is #375BDB the same as CSS royalblue?

No — #375BDB is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#375BDB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #375BDB

Not just a swatch — here's how #375BDB works with other colors. Named schemes with #375BDB in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #375BDB Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5C84F9

Royal 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 Royal Blue.

Coastal Morning Lead · 5 colors

Lead #375BDB Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Royal Blue 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 #375BDB Surface #F6E5D8 Anchor #5B2143 Accent #E5C2CA Secondary #322B2F

Royal Blue 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 #375BDB Secondary #8092BF Support #9D8F88 Ink #18140F

Royal 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 Royal Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #375BDB Secondary #E86A74 Accent #F79250 Anchor #573B58 Surface #F7E7D7

Royal Blue 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 #375BDB 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 10/100

Cool

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

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 51/100

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 25/100

Low

Clean and current — no dusty, aged cast.

Luxury 49/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 77/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 87/100

Very high

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

Surface fit 10/100

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 #375BDB

For UI

For branding

For interior

For fashion

People also use #375BDB with

Lagoon Blue Blue Violet Mustard Yellow Gainsboro Gunmetal Gray

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 5.7:1. Use

Subtle surface Use #DCE1F3 for cards and hover fills. Tint 80

Avoid beside #4C39DB — 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 #375BDB 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: #375BDB;
  --color-base-rgb: 55 91 219;
  --color-base-oklch: oklch(52.4% 0.200 267.1);
  --color-50: #F2F4FD;
  --color-100: #DCE2F9;
  --color-200: #BAC6F2;
  --color-300: #8B9EE4;
  --color-400: #6079D2;
  --color-500: #3E58B7;
  --color-600: #36498C;
  --color-700: #2C3863;
  --color-800: #202741;
  --color-900: #151928;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  royal-blue: {
    50: '#F2F4FD',
    100: '#DCE2F9',
    200: '#BAC6F2',
    300: '#8B9EE4',
    400: '#6079D2',
    500: '#3E58B7',
    600: '#36498C',
    700: '#2C3863',
    800: '#202741',
    900: '#151928',
  },
}

$base: #375BDB;
$base-ink: #FFFFFF;
$base-50: #F2F4FD;
$base-100: #DCE2F9;
$base-200: #BAC6F2;
$base-300: #8B9EE4;
$base-400: #6079D2;
$base-500: #3E58B7;
$base-600: #36498C;
$base-700: #2C3863;
$base-800: #202741;
$base-900: #151928;
$base-hover: #2243BA;
$base-subtle: #C9D1EE;

{
    "color": {
        "base": {
            "value": "#375BDB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F4FD",
                "type": "color"
            },
            "100": {
                "value": "#DCE2F9",
                "type": "color"
            },
            "200": {
                "value": "#BAC6F2",
                "type": "color"
            },
            "300": {
                "value": "#8B9EE4",
                "type": "color"
            },
            "400": {
                "value": "#6079D2",
                "type": "color"
            },
            "500": {
                "value": "#3E58B7",
                "type": "color"
            },
            "600": {
                "value": "#36498C",
                "type": "color"
            },
            "700": {
                "value": "#2C3863",
                "type": "color"
            },
            "800": {
                "value": "#202741",
                "type": "color"
            },
            "900": {
                "value": "#151928",
                "type": "color"
            }
        }
    }
}