What color is #577DEF?

#577DEF is a light, vivid blue. In RGB it is rgb(87, 125, 239), and in HSL hsl(225, 83%, 64%).

Is #577DEF accessible as text?

On white, #577DEF has a contrast ratio of 3.76:1 (fails WCAG AA for body text); on black it is 5.59:1 (passes). For text placed on #577DEF, use black for the best readability.

What is the closest Tailwind color to #577DEF?

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

What colors go well with #577DEF?

#577DEF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EFC957. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #577DEF below.

Is #577DEF good for buttons?

#577DEF works well for buttons and highlights, but use black text on #577DEF — white text only reaches 3.76:1, below the 4.5:1 needed for normal-size labels.

Is #577DEF the same as CSS dodgerblue?

No — #577DEF is not the CSS named color dodgerblue, but dodgerblue (#1E90FF) is the closest CSS named color.

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

Palettes built on #577DEF

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

Coastal Morning Lead · 5 colors

Lead #577DEF 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 #577DEF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #7EA5FF

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 #577DEF Secondary #7F4535 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 #577DEF Surface #F6E5D8 Anchor #5B2143 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 #577DEF Secondary #A0B1D9 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 #577DEF 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 42/100

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 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 42/100

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 19/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #577DEF

For UI

For branding

For interior

For fashion

People also use #577DEF with

Baby Blue Medium Slate Blue Saffron 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 #E2E7F8 for cards and hover fills. Tint 80

Avoid beside #6457EF — 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 #577DEF at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #577DEF;
  --color-base-rgb: 87 125 239;
  --color-base-oklch: oklch(62.0% 0.176 267.3);
  --color-50: #F0F4FE;
  --color-100: #D9E2FD;
  --color-200: #B4C5F8;
  --color-300: #829DED;
  --color-400: #5477DE;
  --color-500: #3156C3;
  --color-600: #2D4795;
  --color-700: #263769;
  --color-800: #1C2644;
  --color-900: #13192A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  signal-blue: {
    50: '#F0F4FE',
    100: '#D9E2FD',
    200: '#B4C5F8',
    300: '#829DED',
    400: '#5477DE',
    500: '#3156C3',
    600: '#2D4795',
    700: '#263769',
    800: '#1C2644',
    900: '#13192A',
  },
}

$base: #577DEF;
$base-ink: #141310;
$base-50: #F0F4FE;
$base-100: #D9E2FD;
$base-200: #B4C5F8;
$base-300: #829DED;
$base-400: #5477DE;
$base-500: #3156C3;
$base-600: #2D4795;
$base-700: #263769;
$base-800: #1C2644;
$base-900: #13192A;
$base-hover: #1B4FEA;
$base-subtle: #D2DBF5;

{
    "color": {
        "base": {
            "value": "#577DEF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E2FD",
                "type": "color"
            },
            "200": {
                "value": "#B4C5F8",
                "type": "color"
            },
            "300": {
                "value": "#829DED",
                "type": "color"
            },
            "400": {
                "value": "#5477DE",
                "type": "color"
            },
            "500": {
                "value": "#3156C3",
                "type": "color"
            },
            "600": {
                "value": "#2D4795",
                "type": "color"
            },
            "700": {
                "value": "#263769",
                "type": "color"
            },
            "800": {
                "value": "#1C2644",
                "type": "color"
            },
            "900": {
                "value": "#13192A",
                "type": "color"
            }
        }
    }
}

Palettes built on #577DEF

Color Lab

Pairs with #577DEF

UI roles & guardrails

In real applications

Scales

Every model

Export