What color is #537CEE?

#537CEE is a light, vivid blue. In RGB it is rgb(83, 124, 238), and in HSL hsl(224, 82%, 63%).

Is #537CEE accessible as text?

On white, #537CEE has a contrast ratio of 3.83:1 (fails WCAG AA for body text); on black it is 5.49:1 (passes). For text placed on #537CEE, use black for the best readability.

What is the closest Tailwind color to #537CEE?

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

What colors go well with #537CEE?

#537CEE pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EEC553. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #537CEE below.

Is #537CEE good for buttons?

#537CEE works well for buttons and highlights, but use black text on #537CEE — white text only reaches 3.83:1, below the 4.5:1 needed for normal-size labels.

Is #537CEE the same as CSS royalblue?

No — #537CEE is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#537CEE Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #537CEE

Not just a swatch — here's how #537CEE works with other colors. Named schemes with #537CEE in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #537CEE Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Signal Blue 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 #537CEE Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #7BA4FF

Signal 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 Signal Blue.

Vintage Leather Lead · 5 colors

Lead #537CEE Secondary #7F4536 Surface #EED7C2 Accent #365246 Anchor #58223A

Signal 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.

Berry & Cream Lead · 5 colors

Lead #537CEE Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Signal 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 #537CEE Secondary #9DAFD8 Support #9D8F88 Ink #18140F

Signal 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 Signal Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #537CEE 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 41/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 41/100

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 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 43/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 48/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 83/100

Very high

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

Surface fit 18/100

Very low

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

Print safety 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #537CEE

For UI

For branding

For interior

For fashion

People also use #537CEE with

Baby Blue Medium Slate Blue Honey 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 4.9:1. Use

Subtle surface Use #E1E7F7 for cards and hover fills. Tint 80

Avoid beside #5E53EE — 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 #537CEE at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

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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: #537CEE;
  --color-base-rgb: 83 124 238;
  --color-base-oklch: oklch(61.5% 0.177 266.4);
  --color-50: #F0F4FE;
  --color-100: #D9E2FC;
  --color-200: #B5C7F8;
  --color-300: #839FED;
  --color-400: #5579DD;
  --color-500: #3259C3;
  --color-600: #2E4994;
  --color-700: #263869;
  --color-800: #1D2744;
  --color-900: #14192A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  signal-blue: {
    50: '#F0F4FE',
    100: '#D9E2FC',
    200: '#B5C7F8',
    300: '#839FED',
    400: '#5579DD',
    500: '#3259C3',
    600: '#2E4994',
    700: '#263869',
    800: '#1D2744',
    900: '#14192A',
  },
}

$base: #537CEE;
$base-ink: #141310;
$base-50: #F0F4FE;
$base-100: #D9E2FC;
$base-200: #B5C7F8;
$base-300: #839FED;
$base-400: #5579DD;
$base-500: #3259C3;
$base-600: #2E4994;
$base-700: #263869;
$base-800: #1D2744;
$base-900: #14192A;
$base-hover: #1950E8;
$base-subtle: #D1DAF4;

{
    "color": {
        "base": {
            "value": "#537CEE",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E2FC",
                "type": "color"
            },
            "200": {
                "value": "#B5C7F8",
                "type": "color"
            },
            "300": {
                "value": "#839FED",
                "type": "color"
            },
            "400": {
                "value": "#5579DD",
                "type": "color"
            },
            "500": {
                "value": "#3259C3",
                "type": "color"
            },
            "600": {
                "value": "#2E4994",
                "type": "color"
            },
            "700": {
                "value": "#263869",
                "type": "color"
            },
            "800": {
                "value": "#1D2744",
                "type": "color"
            },
            "900": {
                "value": "#14192A",
                "type": "color"
            }
        }
    }
}

Palettes built on #537CEE

Color Lab

Pairs with #537CEE

UI roles & guardrails

In real applications

Scales

Every model

Export