What color is #3753BF?

#3753BF is a medium blue. In RGB it is rgb(55, 83, 191), and in HSL hsl(228, 55%, 48%).

Is #3753BF accessible as text?

On white, #3753BF 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 #3753BF, use white for the best readability.

What is the closest Tailwind color to #3753BF?

The nearest Tailwind CSS token is blue-800 (#193CB8).

What colors go well with #3753BF?

#3753BF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BEA337. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3753BF below.

Is #3753BF good for buttons?

#3753BF works well for buttons and highlights, but use white text on #3753BF — black text only reaches 3.15:1, below the 4.5:1 needed for normal-size labels.

Is #3753BF the same as CSS royalblue?

No — #3753BF is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#3753BF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3753BF

Not just a swatch — here's how #3753BF works with other colors. Named schemes with #3753BF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3753BF 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.

Tech Product Signal · 5 colors

Signal #3753BF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5B7ADE

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.

Vintage Leather Lead · 5 colors

Lead #3753BF Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #58223A

Cerulean 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 #3753BF Surface #F6E5D8 Anchor #5B2143 Accent #E5C2CA 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 #3753BF Secondary #7887AD 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.

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Color Lab

How #3753BF 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 11/100

Cool

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

Softness 34/100

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 32/100

Low

A faint retro warmth without tipping into sepia.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 47/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 93/100

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 70/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #3753BF

For UI

For branding

For interior

For fashion

People also use #3753BF with

Picton Blue Grape Brass 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 6.7:1. Use

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

Avoid beside #4937BE — 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 #3753BF 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: #3753BF;
  --color-base-rgb: 55 83 191;
  --color-base-oklch: oklch(48.6% 0.172 268.2);
  --color-50: #F3F5FC;
  --color-100: #DFE3F6;
  --color-200: #C0C9ED;
  --color-300: #94A2DB;
  --color-400: #6B7EC7;
  --color-500: #4A5DAB;
  --color-600: #3F4C83;
  --color-700: #313A5E;
  --color-800: #23293E;
  --color-900: #171A26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F3F5FC',
    100: '#DFE3F6',
    200: '#C0C9ED',
    300: '#94A2DB',
    400: '#6B7EC7',
    500: '#4A5DAB',
    600: '#3F4C83',
    700: '#313A5E',
    800: '#23293E',
    900: '#171A26',
  },
}

$base: #3753BF;
$base-ink: #FFFFFF;
$base-50: #F3F5FC;
$base-100: #DFE3F6;
$base-200: #C0C9ED;
$base-300: #94A2DB;
$base-400: #6B7EC7;
$base-500: #4A5DAB;
$base-600: #3F4C83;
$base-700: #313A5E;
$base-800: #23293E;
$base-900: #171A26;
$base-hover: #2C4298;
$base-subtle: #C7CDE8;

{
    "color": {
        "base": {
            "value": "#3753BF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F5FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE3F6",
                "type": "color"
            },
            "200": {
                "value": "#C0C9ED",
                "type": "color"
            },
            "300": {
                "value": "#94A2DB",
                "type": "color"
            },
            "400": {
                "value": "#6B7EC7",
                "type": "color"
            },
            "500": {
                "value": "#4A5DAB",
                "type": "color"
            },
            "600": {
                "value": "#3F4C83",
                "type": "color"
            },
            "700": {
                "value": "#313A5E",
                "type": "color"
            },
            "800": {
                "value": "#23293E",
                "type": "color"
            },
            "900": {
                "value": "#171A26",
                "type": "color"
            }
        }
    }
}

Palettes built on #3753BF

Color Lab

Pairs with #3753BF

UI roles & guardrails

In real applications

Scales

Every model

Export