What color is #577BF1?

#577BF1 is a light, vivid blue. In RGB it is rgb(87, 123, 241), and in HSL hsl(226, 85%, 64%).

Is #577BF1 accessible as text?

On white, #577BF1 has a contrast ratio of 3.81:1 (fails WCAG AA for body text); on black it is 5.51:1 (passes). For text placed on #577BF1, use black for the best readability.

What is the closest Tailwind color to #577BF1?

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

What colors go well with #577BF1?

#577BF1 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #F1CD55. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #577BF1 below.

Is #577BF1 good for buttons?

#577BF1 works well for buttons and highlights, but use black text on #577BF1 — white text only reaches 3.81:1, below the 4.5:1 needed for normal-size labels.

Is #577BF1 the same as CSS royalblue?

No — #577BF1 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#577BF1 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #577BF1

Not just a swatch — here's how #577BF1 works with other colors. Named schemes with #577BF1 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #577BF1 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 #577BF1 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #7EA3FF

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 #577BF1 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 #577BF1 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 #577BF1 Secondary #9FAFDA 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 #577BF1 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 41/100

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 42/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 49/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 82/100

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 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #577BF1

For UI

For branding

For interior

For fashion

People also use #577BF1 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 #E1E7F8 for cards and hover fills. Tint 80

Avoid beside #6555F1 — 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 #577BF1 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: #577BF1;
  --color-base-rgb: 87 123 241;
  --color-base-oklch: oklch(61.7% 0.181 268.0);
  --color-50: #F0F4FE;
  --color-100: #D8E1FD;
  --color-200: #B4C4F9;
  --color-300: #819AEE;
  --color-400: #5373DF;
  --color-500: #3052C5;
  --color-600: #2C4596;
  --color-700: #25356A;
  --color-800: #1C2645;
  --color-900: #13182A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  signal-blue: {
    50: '#F0F4FE',
    100: '#D8E1FD',
    200: '#B4C4F9',
    300: '#819AEE',
    400: '#5373DF',
    500: '#3052C5',
    600: '#2C4596',
    700: '#25356A',
    800: '#1C2645',
    900: '#13182A',
  },
}

$base: #577BF1;
$base-ink: #141310;
$base-50: #F0F4FE;
$base-100: #D8E1FD;
$base-200: #B4C4F9;
$base-300: #819AEE;
$base-400: #5373DF;
$base-500: #3052C5;
$base-600: #2C4596;
$base-700: #25356A;
$base-800: #1C2645;
$base-900: #13182A;
$base-hover: #194AEC;
$base-subtle: #D2DAF5;

{
    "color": {
        "base": {
            "value": "#577BF1",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E1FD",
                "type": "color"
            },
            "200": {
                "value": "#B4C4F9",
                "type": "color"
            },
            "300": {
                "value": "#819AEE",
                "type": "color"
            },
            "400": {
                "value": "#5373DF",
                "type": "color"
            },
            "500": {
                "value": "#3052C5",
                "type": "color"
            },
            "600": {
                "value": "#2C4596",
                "type": "color"
            },
            "700": {
                "value": "#25356A",
                "type": "color"
            },
            "800": {
                "value": "#1C2645",
                "type": "color"
            },
            "900": {
                "value": "#13182A",
                "type": "color"
            }
        }
    }
}

Palettes built on #577BF1

Color Lab

Pairs with #577BF1

UI roles & guardrails

In real applications

Scales

Every model

Export