What color is #3755CE?

#3755CE is a medium blue. In RGB it is rgb(55, 85, 206), and in HSL hsl(228, 61%, 51%).

Is #3755CE accessible as text?

On white, #3755CE has a contrast ratio of 6.26:1 (passes WCAG AA for body text); on black it is 3.35:1 (fails). For text placed on #3755CE, use white for the best readability.

What is the closest Tailwind color to #3755CE?

The nearest Tailwind CSS token is blue-700 (#1447E6).

What colors go well with #3755CE?

#3755CE pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CEB036. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3755CE below.

Is #3755CE good for buttons?

#3755CE works well for buttons and highlights, but use white text on #3755CE — black text only reaches 3.35:1, below the 4.5:1 needed for normal-size labels.

Is #3755CE the same as CSS royalblue?

No — #3755CE is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#3755CE Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3755CE

Not just a swatch — here's how #3755CE works with other colors. Named schemes with #3755CE in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #3755CE Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5B7EED

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.

Coastal Morning Lead · 5 colors

Lead #3755CE 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.

Berry & Cream Lead · 5 colors

Lead #3755CE 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 #3755CE Secondary #7B8CB6 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.

Sunset Warmth Glow · 5 colors

Glow #3755CE Secondary #E86A74 Accent #F69250 Anchor #573B58 Surface #F7E7D7

Cerulean 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 #3755CE 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 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 53/100

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 27/100

Low

A faint retro warmth without tipping into sepia.

Luxury 52/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 73/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 89/100

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 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #3755CE

For UI

For branding

For interior

For fashion

People also use #3755CE with

Picton Blue Blue Violet Goldenrod 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 6.3:1. Use

Subtle surface Use #DBDFF1 for cards and hover fills. Tint 80

Avoid beside #4A36CE — 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 #3755CE 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: #3755CE;
  --color-base-rgb: 55 85 206;
  --color-base-oklch: oklch(50.2% 0.190 268.1);
  --color-50: #F2F4FC;
  --color-100: #DDE3F8;
  --color-200: #BDC7EF;
  --color-300: #90A0DF;
  --color-400: #677BCB;
  --color-500: #455AB0;
  --color-600: #3B4A87;
  --color-700: #2F3960;
  --color-800: #22283F;
  --color-900: #161A27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F2F4FC',
    100: '#DDE3F8',
    200: '#BDC7EF',
    300: '#90A0DF',
    400: '#677BCB',
    500: '#455AB0',
    600: '#3B4A87',
    700: '#2F3960',
    800: '#22283F',
    900: '#161A27',
  },
}

$base: #3755CE;
$base-ink: #FFFFFF;
$base-50: #F2F4FC;
$base-100: #DDE3F8;
$base-200: #BDC7EF;
$base-300: #90A0DF;
$base-400: #677BCB;
$base-500: #455AB0;
$base-600: #3B4A87;
$base-700: #2F3960;
$base-800: #22283F;
$base-900: #161A27;
$base-hover: #2942A8;
$base-subtle: #C8CFEB;

{
    "color": {
        "base": {
            "value": "#3755CE",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F4FC",
                "type": "color"
            },
            "100": {
                "value": "#DDE3F8",
                "type": "color"
            },
            "200": {
                "value": "#BDC7EF",
                "type": "color"
            },
            "300": {
                "value": "#90A0DF",
                "type": "color"
            },
            "400": {
                "value": "#677BCB",
                "type": "color"
            },
            "500": {
                "value": "#455AB0",
                "type": "color"
            },
            "600": {
                "value": "#3B4A87",
                "type": "color"
            },
            "700": {
                "value": "#2F3960",
                "type": "color"
            },
            "800": {
                "value": "#22283F",
                "type": "color"
            },
            "900": {
                "value": "#161A27",
                "type": "color"
            }
        }
    }
}