What color is #577DE5?

#577DE5 is a light, vivid blue. In RGB it is rgb(87, 125, 229), and in HSL hsl(224, 73%, 62%).

Is #577DE5 accessible as text?

On white, #577DE5 has a contrast ratio of 3.84:1 (fails WCAG AA for body text); on black it is 5.47:1 (passes). For text placed on #577DE5, use black for the best readability.

What is the closest Tailwind color to #577DE5?

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

What colors go well with #577DE5?

#577DE5 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E5BF57. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #577DE5 below.

Is #577DE5 good for buttons?

#577DE5 works well for buttons and highlights, but use black text on #577DE5 — white text only reaches 3.84:1, below the 4.5:1 needed for normal-size labels.

Is #577DE5 the same as CSS royalblue?

No — #577DE5 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#577DE5 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #577DE5

Not just a swatch — here's how #577DE5 works with other colors. Named schemes with #577DE5 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #577DE5 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 #577DE5 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #7EA4FF

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 #577DE5 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 #577DE5 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 #577DE5 Secondary #9EAFD4 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.

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Color Lab

How #577DE5 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 43/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 40/100

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 35/100

Low

A faint retro warmth without tipping into sepia.

Luxury 44/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 44/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 87/100

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 71/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #577DE5

For UI

For branding

For interior

For fashion

People also use #577DE5 with

Sky 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 4.8:1. Use

Subtle surface Use #E1E7F6 for cards and hover fills. Tint 80

Avoid beside #6157E5 — 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 #577DE5 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: #577DE5;
  --color-base-rgb: 87 125 229;
  --color-base-oklch: oklch(61.3% 0.163 266.6);
  --color-50: #F1F4FD;
  --color-100: #DBE3FA;
  --color-200: #B9C8F4;
  --color-300: #88A2E7;
  --color-400: #5D7DD5;
  --color-500: #3A5CBB;
  --color-600: #334C8E;
  --color-700: #2A3A65;
  --color-800: #1F2842;
  --color-900: #151A28;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  signal-blue: {
    50: '#F1F4FD',
    100: '#DBE3FA',
    200: '#B9C8F4',
    300: '#88A2E7',
    400: '#5D7DD5',
    500: '#3A5CBB',
    600: '#334C8E',
    700: '#2A3A65',
    800: '#1F2842',
    900: '#151A28',
  },
}

$base: #577DE5;
$base-ink: #141310;
$base-50: #F1F4FD;
$base-100: #DBE3FA;
$base-200: #B9C8F4;
$base-300: #88A2E7;
$base-400: #5D7DD5;
$base-500: #3A5CBB;
$base-600: #334C8E;
$base-700: #2A3A65;
$base-800: #1F2842;
$base-900: #151A28;
$base-hover: #2253DB;
$base-subtle: #D2DAF2;

{
    "color": {
        "base": {
            "value": "#577DE5",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F4FD",
                "type": "color"
            },
            "100": {
                "value": "#DBE3FA",
                "type": "color"
            },
            "200": {
                "value": "#B9C8F4",
                "type": "color"
            },
            "300": {
                "value": "#88A2E7",
                "type": "color"
            },
            "400": {
                "value": "#5D7DD5",
                "type": "color"
            },
            "500": {
                "value": "#3A5CBB",
                "type": "color"
            },
            "600": {
                "value": "#334C8E",
                "type": "color"
            },
            "700": {
                "value": "#2A3A65",
                "type": "color"
            },
            "800": {
                "value": "#1F2842",
                "type": "color"
            },
            "900": {
                "value": "#151A28",
                "type": "color"
            }
        }
    }
}

Palettes built on #577DE5

Color Lab

Pairs with #577DE5

UI roles & guardrails

In real applications

Scales

Every model

Export